diff --git a/.gitignore b/.gitignore
old mode 100644
new mode 100755
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..2bc9774
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,52 @@
+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, and in the interest of
+fostering an open and welcoming community, we pledge to respect all people who
+contribute through reporting issues, posting feature requests, updating
+documentation, submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project a harassment-free
+experience for everyone, regardless of level of experience, gender, gender
+identity and expression, sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information, such as physical or electronic
+  addresses, without explicit permission
+* Other unethical or unprofessional conduct
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+By adopting this Code of Conduct, project maintainers commit themselves to
+fairly and consistently applying these principles to every aspect of managing
+this project. Project maintainers who do not follow or enforce the Code of
+Conduct may be permanently removed from the project team.
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project maintainers at msfdev@metasploit.com. If
+the incident involves a committer, you may report directly to
+egypt@metasploit.com or todb@metasploit.com.
+
+All complaints will be reviewed and investigated and will result in a
+response that is deemed necessary and appropriate to the circumstances.
+Maintainers are obligated to maintain confidentiality with regard to the
+reporter of an incident.
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 1.3.0, available at
+[http://contributor-covenant.org/version/1/3/0/][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/3/0/
\ No newline at end of file
diff --git a/LICENSE.md b/LICENSE.md
old mode 100644
new mode 100755
diff --git a/README.md b/README.md
old mode 100644
new mode 100755
index b18f3a2..4e322cf
--- a/README.md
+++ b/README.md
@@ -32,8 +32,8 @@ This list consists of only a few examples; applications can be endless:
 - Configuration for silently backup
 - All backup are organized into a catalog
 - List single or all backup by the catalog
-- Backup single PC, with Full,Incremental and Mirror mode;
-- Backup more PCs, with Full,Incremental and Mirror mode (with parallelism algorithm);
+- Backup single PC, with Full,Incremental,Differential and Mirror mode;
+- Backup more PCs, with Full,Incremental,Differential and Mirror mode (with parallelism algorithm);
 - Backup custom folder or predefined data (User,Config,Application,System,Log)
 - Restore backup on the same PC
 - Restore backup in other PC
@@ -64,7 +64,7 @@ bb --help
 Backup a single PC or server is a everyday task. 
 But most of the data may not change in the various backups made;
 then, in these cases, an incremental backup is needed.
-Butterfly Backup natively supports incremental backups, starting from a full.
+Butterfly Backup natively supports incremental and differential backups, starting from a full.
 In this case, the first backup to be performed on the machine will be as follows:
 ```bash
 bb backup --computer pc1 --destination /nas/mybackup --data User Config --type MacOS --mode Full
@@ -148,7 +148,7 @@ bb --help
 
 ## One more thing
 The name butterfly, is born precisely because agent-less; like a butterfly takes the pollen from a flower and brings it elsewhere.
-A backup or restore is performed without any iterationresponsibility on the part of the final machine.
+A backup or restore is performed without any iteration responsibility on the part of the final machine.
 The performances are not altered.
 While all the operations of Butterfly Backup are carried out, the impacted machine can continuously work with peace of mind.
 
diff --git a/_config.yml b/_config.yml
old mode 100644
new mode 100755
diff --git a/bb.man b/bb.man
new file mode 100644
index 0000000..49ae9f0
--- /dev/null
+++ b/bb.man
@@ -0,0 +1,179 @@
+.\" Manpage for Butterfly Backup.
+.\" Contact matteo.guadrini@hotmail.it to correct errors or typos.
+.TH man 1 "11 Dec 2018" "1.4.0" "bb man page"
+.SH NAME
+bb \- Butterfly Backup - backup/restore/archive tool , agentless
+.SH SYNOPSIS
+bb [ACTION] [OPTIONS]
+
+bb [-h] [--verbose] [--log] [--dry-run] [--version]
+          {config,backup,restore,archive,list,export} ...
+.SH DESCRIPTION
+Butterfly Backup is a simple command line wrapper of rsync for complex task, written in python. 
+.SH OPTIONS
+.TP
+action:
+  Valid action
+
+  {config,backup,restore,archive,list,export}
+                        Available actions
+    config              Configuration options
+    backup              Backup options
+    restore             Restore options
+    archive             Archive options
+    list                List options
+    export              Export options
+
+.B backup
+[ACTION]
+
+	--computer HOSTNAME, -c HOSTNAME
+                        	Hostname or ip address to backup
+ 	--list LIST, -L LIST    File list of computers or ip addresses to backup
+  	--destination DESTINATION, -d DESTINATION
+                        	Destination path
+  	--mode {Full,Incremental,Differential,Mirror}, -m {Full,Incremental,Differential,Mirror}
+                            Backup mode
+    --data {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...], -D {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...]
+                        	Data of which you want to backup
+  	--custom-data, -D CUSTOMDATA [CUSTOMDATA ...], -C CUSTOMDATA [CUSTOMDATA ...]
+                        	Custom path of which you want to backup
+  	--user USER, -u USER    Login name used to log into the remote host (being
+                        	backed up)
+  	--type {Unix,Windows,MacOS}, -t {Unix,Windows,MacOS}
+                        	Type of operating system to backup
+  	--compress, -z          Compress data
+  	--retention RETENTION, -r RETENTION
+                        	Number of days of backup retention
+  	--parallel PARALLEL, -p PARALLEL
+                        	Number of parallel jobs
+  	--timeout TIMEOUT, -T TIMEOUT
+                        	I/O timeout in seconds
+    --skip-error, -e        Skip error.
+
+.B list 
+[ACTION]
+
+	--catalog CATALOG, -C CATALOG
+                        	Folder where is catalog file
+  	--backup-id ID, -i ID
+                        	Backup-id of backup
+  	--archived, -a        	List only archived backup
+  	--cleaned, -c         	List only cleaned backup
+  	--computer HOSTNAME, -H HOSTNAME
+                        	List only match hostname or ip
+  	--oneline, -o           One line output
+
+.B restore 
+[ACTION]
+
+	--catalog CATALOG, -C CATALOG
+                        	Folder where is catalog file
+  	--backup-id ID, -i ID
+                        	Backup-id of backup
+  	--last, -L            Last available backup
+  	--user USER, -u USER  Login name used to log into the remote host (where
+                        you're restoring)
+  	--computer HOSTNAME, -c HOSTNAME
+                        Hostname or ip address to perform restore
+  	--type {Unix,Windows,MacOS}, -t {Unix,Windows,MacOS}
+                        	Type of operating system to perform restore
+  	--timeout TIMEOUT, -T TIMEOUT
+                        	I/O timeout in seconds
+  	--mirror, -m            Mirror mode
+  	--skip-error, -e        Skip error.
+
+.B config 
+[ACTION]
+
+Init configuration:
+    --new, -n               Generate new configuration
+    --remove, -r            Remove exist configuration
+
+Deploy configuration:
+    --deploy DEPLOY_HOST, -d DEPLOY_HOST
+                            Deploy configuration to client: hostname or ip address
+    --user DEPLOY_USER, -u DEPLOY_USER
+                            User of the remote machine
+
+.B archive 
+[ACTION]
+
+    --catalog CATALOG, -C CATALOG
+                            Folder where is catalog file
+    --days DAYS, -D DAYS    Number of days of archive retention
+    --destination DESTINATION, -d DESTINATION
+                            Archive destination path
+
+.B export
+[ACTION]
+    --catalog CATALOG, -C CATALOG
+                           Folder where is catalog file
+    --backup-id ID, -i ID
+                          Backup-id of backup
+    --destination DESTINATION, -d DESTINATION
+                          Destination path
+    --mirror, -m          Mirror mode
+    --cut, -c             Cut mode. Delete source
+    --include INCLUDE [INCLUDE ...], -I INCLUDE [INCLUDE ...]
+                          Include pattern
+    --exclude EXCLUDE [EXCLUDE ...], -E EXCLUDE [EXCLUDE ...]
+                          Exclude pattern
+    --timeout TIMEOUT, -T TIMEOUT
+                          I/O timeout in seconds
+    --skip-error, -e      Skip error
+
+.B optional arguments 
+[OPTIONS]
+
+  -h, --help                show help message and exit
+  --verbose, -v             Enable verbosity
+  --log, -l                 Create a log
+  --dry-run, -N             Dry run mode
+  --version, -V             Print version
+
+.SH EXAMPLES
+Show full help:
+    O_O>$ bb --help
+
+Backup single machine:
+    O_O>$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
+
+Backup multiple machine:
+    O_O>$ > hosts.txt
+    host1
+    host2
+    host3
+    ^D
+    O_O>$ bb backup --list hosts.txt --destination /mnt/backup --data User Config --type MacOS
+
+List catalog backups:
+    O_O>$ bb list --catalog /mnt/backup
+
+List backup details:
+    O_O>$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
+
+Restore machine with log:
+    O_O>$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
+
+Archive backups older than 3 days:
+    O_O>$ bb archive --catalog /mnt/backup/ --days 3 --destination /mnt/archive/ --verbose
+
+Create configuration (RSA key):
+    O_O>$ bb config --new
+
+Deploy configuration to machine:
+    O_O>$ bb config --deploy host1
+
+Export a backup to another path:
+    O_O>$ bb export --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /mnt/export
+
+.SH SEE ALSO
+Full documentation is here:
+https://butterfly-backup.readthedocs.io/en/latest/
+.SH BUGS
+No known bugs.
+.SH AUTHOR
+Matteo Guadrini <matteo.guadrini@hotmail.it>
+.SH COPYRIGHT
+(c) Matteo Guadrini. All rights reserved.
\ No newline at end of file
diff --git a/bb.py b/bb.py
old mode 100644
new mode 100755
index 7d7f90e..fbe3383
--- a/bb.py
+++ b/bb.py
@@ -31,7 +31,7 @@
 from utility import print_verbose
 
 # region Global Variables
-VERSION = '1.2.0'
+VERSION = '1.4.0'
 
 
 # endregion
@@ -127,7 +127,7 @@ def run_in_parallel(fn, commands, limit):
         # Run the function
         proc = pool.apply_async(func=fn, args=(command, ))
         jobs.append(proc)
-        print('Start {0} on {1}'.format(args.action, plog['hostname']))
+        print('Start {0} {1}'.format(args.action, plog['hostname']))
         print_verbose(args.verbose, "rsync command: {0}".format(command))
         utility.write_log(log_args['status'], plog['destination'], 'INFO', 'Start process {0} on {1}'.format(
             args.action, plog['hostname']
@@ -249,6 +249,7 @@ def compose_command(flags, host):
     print_verbose(args.verbose, 'Build a rsync command')
     # Set rsync binary
     command = ['rsync']
+    catalog = read_catalog(catalog_path)
     if flags.action == 'backup':
         # Set mode option
         if flags.mode == 'Full':
@@ -257,11 +258,11 @@ def compose_command(flags, host):
             # Write catalog file
             write_catalog(catalog_path, backup_id, 'type', 'Full')
         elif flags.mode == 'Incremental':
-            last_full = get_last_full(catalog_path)
-            if last_full:
+            last_bck = get_last_backup(catalog)
+            if last_bck:
                 command.append('-ahu')
                 command.append('--no-links')
-                command.append('--link-dest={0}'.format(last_full))
+                command.append('--link-dest={0}'.format(last_bck[0]))
                 # Write catalog file
                 write_catalog(catalog_path, backup_id, 'type', 'Incremental')
             else:
@@ -269,6 +270,19 @@ def compose_command(flags, host):
                 command.append('--no-links')
                 # Write catalog file
                 write_catalog(catalog_path, backup_id, 'type', 'Full')
+        elif flags.mode == 'Differential':
+            last_full = get_last_full(catalog)
+            if last_full:
+                command.append('-ahu')
+                command.append('--no-links')
+                command.append('--link-dest={0}'.format(last_full[0]))
+                # Write catalog file
+                write_catalog(catalog_path, backup_id, 'type', 'Differential')
+            else:
+                command.append('-ah')
+                command.append('--no-links')
+                # Write catalog file
+                write_catalog(catalog_path, backup_id, 'type', 'Full')
         elif flags.mode == 'Mirror':
             command.append('-ah')
             command.append('--delete')
@@ -277,6 +291,9 @@ def compose_command(flags, host):
         # Set verbosity
         if flags.verbose:
             command.append('-vP')
+        # Set quite mode
+        if flags.skip_err:
+            command.append('--quiet')
         # Set compress mode
         if flags.compress:
             command.append('-z')
@@ -298,6 +315,9 @@ def compose_command(flags, host):
         command.append('-ahu --no-perms --no-owner --no-group')
         if flags.verbose:
             command.append('-vP')
+            # Set quite mode
+        if flags.skip_err:
+            command.append('--quiet')
         # Set I/O timeout
         if flags.timeout:
             command.append('--timeout={0}'.format(flags.timeout))
@@ -316,6 +336,31 @@ def compose_command(flags, host):
             )
             utility.write_log(log_args['status'], log_args['destination'], 'INFO',
                               'rsync log path: {0}'.format(log_path))
+    elif flags.action == 'export':
+        command.append('-ahu --no-perms --no-owner --no-group')
+        if flags.verbose:
+            command.append('-vP')
+            # Set quite mode
+        if flags.skip_err:
+            command.append('--quiet')
+        # Set I/O timeout
+        if flags.timeout:
+            command.append('--timeout={0}'.format(flags.timeout))
+        # Set mirror mode
+        if flags.mirror:
+            command.append('--delete')
+            command.append('--ignore-times')
+        # Set dry-run mode
+        if flags.dry_run:
+            command.append('--dry-run')
+            utility.write_log(log_args['status'], log_args['destination'], 'INFO', 'dry-run mode activate')
+        if flags.log:
+            log_path = os.path.join(rpath, 'export.log')
+            command.append(
+                '--log-file={0}'.format(log_path)
+            )
+            utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                              'rsync log path: {0}'.format(log_path))
     print_verbose(args.verbose, 'Command flags are: {0}'.format(' '.join(command)))
     return command
 
@@ -402,7 +447,11 @@ def compose_destination(computer_name, folder):
     """
     # Create root folder of backup
     first_layer = os.path.join(folder, computer_name)
-    second_layer = os.path.join(first_layer, utility.time_for_folder())
+    # Check if backup is a Mirror or not
+    if args.mode != 'Mirror':
+        second_layer = os.path.join(first_layer, utility.time_for_folder())
+    else:
+        second_layer = os.path.join(first_layer, 'mirror_backup')
     if not os.path.exists(first_layer):
         os.mkdir(first_layer)
         utility.write_log(log_args['status'], log_args['destination'], 'INFO',
@@ -421,14 +470,21 @@ def get_last_full(catalog):
     """
     Get the last full
     :param catalog: configparser object
-    :return: path (string)
+    :return: path (string), os (string)
     """
-    config = read_catalog(catalog)
+    config = catalog
     if config:
         dates = []
         for bid in config.sections():
-            if config.get(bid, 'type') == 'Full' and config.get(bid, 'name') == hostname:
-                dates.append(utility.string_to_time(config.get(bid, 'timestamp')))
+            if config.get(bid, 'type') == 'Full' \
+                    and config.get(bid, 'name') == hostname \
+                    and (not config.has_option(bid, 'cleaned') or not config.has_option(bid, 'archived')):
+                try:
+                    dates.append(utility.string_to_time(config.get(bid, 'timestamp')))
+                except configparser.NoOptionError:
+                    print(utility.PrintColor.RED +
+                          "ERROR: Corrupted catalog! No found timestamp in {0}".format(bid) + utility.PrintColor.END)
+                    exit(2)
         if dates:
             last_full = utility.time_to_string(max(dates))
             if last_full:
@@ -437,7 +493,7 @@ def get_last_full(catalog):
                     if config.get(bid, 'type') == 'Full' and \
                             config.get(bid, 'name') == hostname and \
                             config.get(bid, 'timestamp') == last_full:
-                        return config.get(bid, 'path')
+                        return config.get(bid, 'path'), config.get(bid, 'os')
     else:
         return False
 
@@ -446,14 +502,20 @@ def get_last_backup(catalog):
     """
     Get the last available backup
     :param catalog: configparser object
-    :return: path (string)
+    :return: path (string), os (string)
     """
     config = catalog
     dates = []
     if config:
         for bid in config.sections():
-            if config.get(bid, 'name') == hostname:
-                dates.append(utility.string_to_time(config.get(bid, 'timestamp')))
+            if config.get(bid, 'name') == hostname \
+                    and (not config.has_option(bid, 'cleaned') or not config.has_option(bid, 'archived')):
+                try:
+                    dates.append(utility.string_to_time(config.get(bid, 'timestamp')))
+                except configparser.NoOptionError:
+                    print(utility.PrintColor.RED +
+                          "ERROR: Corrupted catalog! No found timestamp in {0}".format(bid) + utility.PrintColor.END)
+                    exit(2)
         if dates:
             dates.sort()
             last = utility.time_to_string(dates[-1])
@@ -461,6 +523,8 @@ def get_last_backup(catalog):
                 for bid in config.sections():
                     if config.get(bid, 'name') == hostname and config.get(bid, 'timestamp') == last:
                         return config.get(bid, 'path'), config.get(bid, 'os')
+    else:
+        return False
 
 
 def count_full(config, name):
@@ -607,8 +671,8 @@ def deploy_configuration(computer, user):
     print_verbose(args.verbose, 'Public id_rsa is {0}'.format(id_rsa_pub_file))
     if not dry_run('Copying configuration to {0}'.format(computer)):
         if os.path.exists(id_rsa_pub_file):
-            print('Copying configuration to' + utility.PrintColor.BOLD + ' {0}'.format(computer) + utility.PrintColor.END +
-                  '; write the password:')
+            print('Copying configuration to' + utility.PrintColor.BOLD + ' {0}'.format(computer) +
+                  utility.PrintColor.END + '; write the password:')
             return_code = subprocess.call('ssh-copy-id -i {0} {1}@{2}'.format(id_rsa_pub_file, user, computer),
                                           shell=True)
             print_verbose(args.verbose, 'Return code of ssh-copy-id: {0}'.format(return_code))
@@ -620,7 +684,8 @@ def deploy_configuration(computer, user):
                     computer) +
                       utility.PrintColor.END)
         else:
-            print(utility.PrintColor.YELLOW + "WARNING: Public key ~/.ssh/id_rsa.pub is not exist" + utility.PrintColor.END)
+            print(utility.PrintColor.YELLOW + "WARNING: Public key ~/.ssh/id_rsa.pub is not exist" +
+                  utility.PrintColor.END)
             exit(2)
 
 
@@ -640,7 +705,8 @@ def remove_configuration():
                 os.remove(id_rsa_file)
             else:
                 print(
-                    utility.PrintColor.YELLOW + "WARNING: Private key ~/.ssh/id_rsa is not exist" + utility.PrintColor.END)
+                    utility.PrintColor.YELLOW + "WARNING: Private key ~/.ssh/id_rsa is not exist" +
+                    utility.PrintColor.END)
                 exit(2)
             # Remove public key file
             id_rsa_pub_file = os.path.join(ssh_folder, 'id_rsa.pub')
@@ -696,7 +762,8 @@ def new_configuration():
                 id_rsa.write(private_key_str)
         else:
             print(utility.PrintColor.YELLOW + "WARNING: Private key ~/.ssh/id_rsa exists" + utility.PrintColor.END)
-            print('If you want to use the existing key, run "bb config --deploy name_of_machine", otherwise to remove it, '
+            print('If you want to use the existing key, run "bb config --deploy name_of_machine", '
+                  'otherwise to remove it, '
                   'run "bb config --remove"')
             exit(2)
         # Create private key file
@@ -708,7 +775,8 @@ def new_configuration():
                 id_rsa_pub.write(public_key_str)
         else:
             print(utility.PrintColor.YELLOW + "WARNING: Public key ~/.ssh/id_rsa.pub exists" + utility.PrintColor.END)
-            print('If you want to use the existing key, run "bb config --deploy name_of_machine", otherwise to remove it, '
+            print('If you want to use the existing key, run "bb config --deploy name_of_machine", '
+                  'otherwise to remove it, '
                   'run "bb config --remove"')
             exit(2)
         print(utility.PrintColor.GREEN + "SUCCESS: New configuration successfully created!" + utility.PrintColor.END)
@@ -724,13 +792,9 @@ def check_configuration(ip):
     try:
         out = check_output(["ssh-keyscan", "{0}".format(ip)])
         if not out:
-            print(utility.PrintColor.RED +
-                  '''ERROR: For bulk or silently backup to deploy configuration!
-See bb deploy --help or specify --verbose
-                  ''' + utility.PrintColor.END)
+            return False
     except subprocess.CalledProcessError:
-        print(utility.PrintColor.RED + 'ERROR: Keyscan failed! Check ip {0}'.format(ip) + utility.PrintColor.END)
-        exit(1)
+        return False
 
 
 def parse_arguments():
@@ -777,7 +841,7 @@ def parse_arguments():
     group_backup.add_argument('--destination', '-d', help='Destination path', dest='destination', action='store',
                               required=True)
     group_backup.add_argument('--mode', '-m', help='Backup mode', dest='mode', action='store',
-                              choices=['Full', 'Incremental', 'Mirror'], default='Incremental')
+                              choices=['Full', 'Incremental', 'Differential', 'Mirror'], default='Incremental')
     data_or_custom = group_backup.add_mutually_exclusive_group(required=True)
     data_or_custom.add_argument('--data', '-D', help='Data of which you want to backup', dest='data', action='store',
                                 choices=['User', 'Config', 'Application', 'System', 'Log'], nargs='+')
@@ -795,6 +859,7 @@ def parse_arguments():
                               type=int, default=5)
     group_backup.add_argument('--timeout', '-T', help='I/O timeout in seconds', dest='timeout', action='store',
                               type=int)
+    group_backup.add_argument('--skip-error', '-e', help='Skip error', dest='skip_err', action='store_true')
     # restore session
     restore = action.add_parser('restore', help='Restore options', parents=[parent_parser])
     group_restore = restore.add_argument_group(title='Restore options')
@@ -813,6 +878,7 @@ def parse_arguments():
     group_restore.add_argument('--timeout', '-T', help='I/O timeout in seconds', dest='timeout', action='store',
                                type=int)
     group_restore.add_argument('--mirror', '-m', help='Mirror mode', dest='mirror', action='store_true')
+    group_restore.add_argument('--skip-error', '-e', help='Skip error', dest='skip_err', action='store_true')
     # archive session
     archive = action.add_parser('archive', help='Archive options', parents=[parent_parser])
     group_archive = archive.add_argument_group(title='Archive options')
@@ -827,9 +893,33 @@ def parse_arguments():
     group_list = list_action.add_argument_group(title='List options')
     group_list.add_argument('--catalog', '-C', help='Folder where is catalog file', dest='catalog', action='store',
                             required=True)
-    group_list.add_argument('--backup-id', '-i', help='Backup-id of backup', dest='id', action='store')
-    group_list.add_argument('--archived', '-a', help='List only archived backup', dest='archived', action='store_true')
-    group_list.add_argument('--cleaned', '-c', help='List only cleaned backup', dest='cleaned', action='store_true')
+    group_list_mutually = group_list.add_mutually_exclusive_group()
+    group_list_mutually.add_argument('--backup-id', '-i', help='Backup-id of backup', dest='id', action='store')
+    group_list_mutually.add_argument('--archived', '-a', help='List only archived backup', dest='archived',
+                                     action='store_true')
+    group_list_mutually.add_argument('--cleaned', '-c', help='List only cleaned backup', dest='cleaned',
+                                     action='store_true')
+    group_list_mutually.add_argument('--computer', '-H', help='List only match hostname or ip', dest='hostname',
+                                     action='store')
+    group_list.add_argument('--oneline', '-o', help='One line output', dest='oneline', action='store_true')
+    # export session
+    export_action = action.add_parser('export', help='Export options', parents=[parent_parser])
+    group_export = export_action.add_argument_group(title='Export options')
+    group_export.add_argument('--catalog', '-C', help='Folder where is catalog file', dest='catalog', action='store',
+                              required=True)
+    group_export.add_argument('--backup-id', '-i', help='Backup-id of backup', dest='id', action='store', required=True)
+    group_export.add_argument('--destination', '-d', help='Destination path', dest='destination', action='store',
+                              required=True)
+    group_export.add_argument('--mirror', '-m', help='Mirror mode', dest='mirror', action='store_true')
+    group_export.add_argument('--cut', '-c', help='Cut mode. Delete source', dest='cut', action='store_true')
+    group_export_mutually = group_export.add_mutually_exclusive_group()
+    group_export_mutually.add_argument('--include', '-I', help='Include pattern', dest='include', action='store',
+                                       nargs='+')
+    group_export_mutually.add_argument('--exclude', '-E', help='Exclude pattern', dest='exclude', action='store',
+                                       nargs='+')
+    group_export.add_argument('--timeout', '-T', help='I/O timeout in seconds', dest='timeout', action='store',
+                              type=int)
+    group_export.add_argument('--skip-error', '-e', help='Skip error', dest='skip_err', action='store_true')
     # Return all args
     parser_object.add_argument('--version', '-V', help='Print version', dest='version', action='store_true')
     return parser_object
@@ -887,7 +977,10 @@ def parse_arguments():
                       + utility.PrintColor.END)
                 continue
             if not args.verbose:
-                check_configuration(hostname)
+                if check_configuration(hostname):
+                    print(utility.PrintColor.RED + '''ERROR: For bulk or silently backup to deploy configuration!
+                            See bb deploy --help or specify --verbose''' + utility.PrintColor.END)
+                    continue
             # Log information's
             backup_id = '{}'.format(utility.new_id())
             log_args = {
@@ -983,7 +1076,10 @@ def parse_arguments():
                   + utility.PrintColor.END)
             exit(1)
         if not args.verbose:
-            check_configuration(rhost)
+            if not check_configuration(rhost):
+                print(utility.PrintColor.RED + '''ERROR: For bulk or silently backup to deploy configuration!
+                                            See bb deploy --help or specify --verbose''' + utility.PrintColor.END)
+                exit(1)
         log_args = {
             'hostname': rhost,
             'status': args.log,
@@ -1034,39 +1130,73 @@ def parse_arguments():
         list_catalog = read_catalog(os.path.join(args.catalog, '.catalog.cfg'))
         # Check specified argument backup-id
         if args.id:
-            utility.print_verbose(args.verbose, "Select backup-id: {0}".format(args.id))
-            if not list_catalog.has_section(args.id):
-                print(utility.PrintColor.RED +
-                      'ERROR: Backup-id {0} not exist!'.format(args.id)
-                      + utility.PrintColor.END)
-                exit(1)
-            print('Backup id: ' + utility.PrintColor.BOLD + args.id +
-                  utility.PrintColor.END)
-            print('Hostname or ip: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['name'] +
-                  utility.PrintColor.END)
-            print('Type: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['type'] +
-                  utility.PrintColor.END)
-            print('Timestamp: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['timestamp'] +
-                  utility.PrintColor.END)
-            print('Start: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['start'] +
-                  utility.PrintColor.END)
-            print('Finish: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['end'] +
-                  utility.PrintColor.END)
-            print('OS: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['os'] +
-                  utility.PrintColor.END)
-            print('ExitCode: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['status'] +
-                  utility.PrintColor.END)
-            print('Path: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['path'] +
-                  utility.PrintColor.END)
-            if list_catalog.get(args.id, 'cleaned', fallback=False):
-                print('Cleaned: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['cleaned'] +
+            if not args.oneline:
+                utility.print_verbose(args.verbose, "Select backup-id: {0}".format(args.id))
+                if not list_catalog.has_section(args.id):
+                    print(utility.PrintColor.RED +
+                          'ERROR: Backup-id {0} not exist!'.format(args.id)
+                          + utility.PrintColor.END)
+                    exit(1)
+                print('Backup id: ' + utility.PrintColor.BOLD + args.id +
                       utility.PrintColor.END)
-            elif list_catalog.get(args.id, 'archived', fallback=False):
-                print('Archived: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['archived'] +
+                print('Hostname or ip: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['name'] +
                       utility.PrintColor.END)
-            else:
-                print('List: ' + utility.PrintColor.DARKCYAN + '\n'.join(os.listdir(list_catalog[args.id]['path'])) +
+                print('Type: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['type'] +
+                      utility.PrintColor.END)
+                print('Timestamp: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['timestamp'] +
+                      utility.PrintColor.END)
+                print('Start: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['start'] +
+                      utility.PrintColor.END)
+                print('Finish: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['end'] +
+                      utility.PrintColor.END)
+                print('OS: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['os'] +
+                      utility.PrintColor.END)
+                print('ExitCode: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['status'] +
+                      utility.PrintColor.END)
+                print('Path: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['path'] +
                       utility.PrintColor.END)
+                if list_catalog.get(args.id, 'cleaned', fallback=False):
+                    print('Cleaned: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['cleaned'] +
+                          utility.PrintColor.END)
+                elif list_catalog.get(args.id, 'archived', fallback=False):
+                    print('Archived: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['archived'] +
+                          utility.PrintColor.END)
+                else:
+                    print('List: ' + utility.PrintColor.DARKCYAN + '\n'.join(os.listdir(list_catalog[args.id]['path']))
+                          + utility.PrintColor.END)
+            else:
+                if not list_catalog.has_section(args.id):
+                    print(utility.PrintColor.RED +
+                          'ERROR: Backup-id {0} not exist!'.format(args.id)
+                          + utility.PrintColor.END)
+                    exit(1)
+                print('Id: ' + utility.PrintColor.BOLD + args.id +
+                      utility.PrintColor.END, end=' - ')
+                print('Name: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['name'] +
+                      utility.PrintColor.END, end=' - ')
+                print('Type: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['type'] +
+                      utility.PrintColor.END, end=' - ')
+                print('Timestamp: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['timestamp'] +
+                      utility.PrintColor.END, end=' - ')
+                print('Start: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['start'] +
+                      utility.PrintColor.END, end=' - ')
+                print('Finish: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['end'] +
+                      utility.PrintColor.END, end=' - ')
+                print('OS: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['os'] +
+                      utility.PrintColor.END, end=' - ')
+                print('ExitCode: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['status'] +
+                      utility.PrintColor.END, end=' - ')
+                print('Path: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['path'] +
+                      utility.PrintColor.END, end=' - ')
+                if list_catalog.get(args.id, 'cleaned', fallback=False):
+                    print('Cleaned: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['cleaned'] +
+                          utility.PrintColor.END, end=' - ')
+                elif list_catalog.get(args.id, 'archived', fallback=False):
+                    print('Archived: ' + utility.PrintColor.DARKCYAN + list_catalog[args.id]['archived'] +
+                          utility.PrintColor.END, end=' - ')
+                else:
+                    print('List: ' + utility.PrintColor.DARKCYAN + ' '.join(os.listdir(list_catalog[args.id]['path'])) +
+                          utility.PrintColor.END)
         elif args.archived:
             utility.print_verbose(args.verbose, "List all archived backup in catalog")
             text = 'BUTTERFLY BACKUP CATALOG (ARCHIVED)\n\n'
@@ -1112,17 +1242,102 @@ def parse_arguments():
             text = 'BUTTERFLY BACKUP CATALOG\n\n'
             utility.write_log(log_args['status'], log_args['destination'], 'INFO',
                               'BUTTERFLY BACKUP CATALOG')
-            for lid in list_catalog.sections():
-                utility.write_log(log_args['status'], log_args['destination'], 'INFO',
-                                  'Backup id: {0}'.format(lid))
-                utility.write_log(log_args['status'], log_args['destination'], 'INFO',
-                                  'Hostname or ip: {0}'.format(list_catalog[lid]['name']))
-                utility.write_log(log_args['status'], log_args['destination'], 'INFO',
-                                  'Timestamp: {0}'.format(list_catalog[lid]['timestamp']))
-                text += 'Backup id: {0}'.format(lid)
-                text += '\n'
-                text += 'Hostname or ip: {0}'.format(list_catalog[lid]['name'])
-                text += '\n'
-                text += 'Timestamp: {0}'.format(list_catalog[lid]['timestamp'])
-                text += '\n\n'
+            if args.hostname:
+                for lid in list_catalog.sections():
+                    if list_catalog[lid]['name'] == args.hostname:
+                        utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                                          'Backup id: {0}'.format(lid))
+                        utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                                          'Hostname or ip: {0}'.format(list_catalog[lid]['name']))
+                        utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                                          'Timestamp: {0}'.format(list_catalog[lid]['timestamp']))
+                        text += 'Backup id: {0}'.format(lid)
+                        text += '\n'
+                        text += 'Hostname or ip: {0}'.format(list_catalog[lid]['name'])
+                        text += '\n'
+                        text += 'Timestamp: {0}'.format(list_catalog[lid]['timestamp'])
+                        text += '\n\n'
+            else:
+                for lid in list_catalog.sections():
+                    utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                                      'Backup id: {0}'.format(lid))
+                    utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                                      'Hostname or ip: {0}'.format(list_catalog[lid]['name']))
+                    utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                                      'Timestamp: {0}'.format(list_catalog[lid]['timestamp']))
+                    text += 'Backup id: {0}'.format(lid)
+                    text += '\n'
+                    text += 'Hostname or ip: {0}'.format(list_catalog[lid]['name'])
+                    text += '\n'
+                    text += 'Timestamp: {0}'.format(list_catalog[lid]['timestamp'])
+                    text += '\n\n'
             utility.pager(text)
+
+    # Check export session
+    if args.action == 'export':
+        cmds = list()
+        # Read catalog file
+        export_catalog = read_catalog(os.path.join(args.catalog, '.catalog.cfg'))
+        # Check specified argument backup-id
+        if not export_catalog.has_section(args.id):
+            print(utility.PrintColor.RED +
+                  'ERROR: Backup-id {0} not exist!'.format(args.id)
+                  + utility.PrintColor.END)
+            exit(1)
+        print_verbose(args.verbose, 'Export backup with id {0}'.format(args.id))
+        # Log info
+        log_args = {
+            'hostname': export_catalog[args.id]['Name'],
+            'status': args.log,
+            'destination': os.path.join(export_catalog[args.id]['Path'], 'export.log')
+        }
+        if os.path.exists(export_catalog[args.id]['Path']) and os.path.exists(args.destination):
+            # Export
+            utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                              'Export {0}. Folder {1} to {2}'.format(args.id, export_catalog[args.id]['Path'],
+                                                                     args.destination))
+            # Compose command
+            print_verbose(args.verbose, 'Build a rsync command')
+            logs = list()
+            logs.append(log_args)
+            # Set rsync binary and flags
+            expcmd = list()
+            expcmd.append('rsync')
+            expcmd.append('-ah')
+            expcmd.append('--no-links')
+            # Check flags
+            if args.verbose:
+                expcmd.append('-vP')
+            if args.mirror:
+                expcmd.append('--delete')
+            if args.cut:
+                expcmd.append('--remove-source-files')
+            if args.include:
+                for include in args.include:
+                    expcmd.append('--include={0}'.format(include))
+                expcmd.append('--exclude="*"')
+            if args.exclude:
+                for exclude in args.exclude:
+                    expcmd.append('--exclude={0}'.format(exclude))
+            if args.timeout:
+                expcmd.append('--timeout={0}'.format(args.timeout))
+            if args.skip_err:
+                expcmd.append('--quiet')
+            if args.log:
+                exp_log_path = os.path.join(args.destination, 'export.log')
+                expcmd.append(
+                    '--log-file={0}'.format(exp_log_path)
+                )
+            # Add source
+            expcmd.append('{}'.format(export_catalog[args.id]['Path']))
+            # Add destination
+            expcmd.append('{}'.format(os.path.join(args.destination, export_catalog[args.id]['Name'])))
+            utility.write_log(log_args['status'], log_args['destination'], 'INFO',
+                              'Export command {0}.'.format(" ".join(expcmd)))
+            # Start export
+            cmds.append(' '.join(expcmd))
+            run_in_parallel(start_process, cmds, 1)
+        else:
+            print(utility.PrintColor.RED +
+                  "ERROR: Source or destination path doesn't exist!" + utility.PrintColor.END)
+            exit(1)
diff --git a/docs/Makefile b/docs/Makefile
old mode 100644
new mode 100755
diff --git a/docs/build/doctrees/backup.doctree b/docs/build/doctrees/backup.doctree
old mode 100644
new mode 100755
diff --git a/docs/build/doctrees/environment.pickle b/docs/build/doctrees/environment.pickle
old mode 100644
new mode 100755
index c3b19a4..612f6ca
Binary files a/docs/build/doctrees/environment.pickle and b/docs/build/doctrees/environment.pickle differ
diff --git a/docs/build/doctrees/index.doctree b/docs/build/doctrees/index.doctree
old mode 100644
new mode 100755
index 24519ed..5a0f179
Binary files a/docs/build/doctrees/index.doctree and b/docs/build/doctrees/index.doctree differ
diff --git a/docs/build/html/.buildinfo b/docs/build/html/.buildinfo
old mode 100644
new mode 100755
index 48c32cb..142f6b0
--- a/docs/build/html/.buildinfo
+++ b/docs/build/html/.buildinfo
@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: 5a0ff6af6cf626bd878c7dc1cd68852d
+config: fcd3a7349e495b52c72a060fa709375b
 tags: 645f666f9bcd5a90fca523b33c5a78b7
diff --git a/docs/build/html/_sources/backup.rst.txt b/docs/build/html/_sources/backup.rst.txt
old mode 100644
new mode 100755
diff --git a/docs/build/html/_sources/index.rst.txt b/docs/build/html/_sources/index.rst.txt
old mode 100644
new mode 100755
index cac52aa..799efea
--- a/docs/build/html/_sources/index.rst.txt
+++ b/docs/build/html/_sources/index.rst.txt
@@ -22,6 +22,7 @@ Indices and tables
 * :ref:`list`
 * :ref:`restore`
 * :ref:`archive`
+* :ref:`export`
 * :ref:`search`
 
 .. _requirements:
@@ -41,10 +42,11 @@ Install Butterfly Backup is very simple; run this:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ git clone https://github.com/MatteoGuadrini/Butterfly-Backup.git
-   arthur@goldenheart$ cd Butterfly-Backup
-   arthur@goldenheart$ sudo python3 setup.py
-   arthur@goldenheart$ bb --help
+   arthur@heartofgold$ git clone https://github.com/MatteoGuadrini/Butterfly-Backup.git
+   arthur@heartofgold$ cd Butterfly-Backup
+   arthur@heartofgold$ sudo python3 setup.py
+   arthur@heartofgold$ bb --help
+   arthur@heartofgold$ man bb
 
 The upgrade is also simple; type the same commands.
 
@@ -62,7 +64,7 @@ Backups are organized according to precise cataloguing; this is an example:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ tree destination/of/backup
+   arthur@heartofgold$ tree destination/of/backup
    .
    ├── destination
    │   ├── hostname or ip of the PC under backup
@@ -91,13 +93,13 @@ This is how the operating system sees the backups on the file system:
 .. important::
    Be careful to not delete *.catalog.cfg* file.
 
-Backup butterfly has, in its core, five main operations:
+Butterfly Backup has, in its core, six main operations:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb --help
+   arthur@heartofgold$ bb --help
    usage: bb [-h] [--verbose] [--log] [--dry-run] [--version]
-             {config,backup,restore,archive,list} ...
+             {config,backup,restore,archive,list,export} ...
 
    Butterfly Backup
 
@@ -111,13 +113,14 @@ Backup butterfly has, in its core, five main operations:
    action:
      Valid action
 
-     {config,backup,restore,archive,list}
+     {config,backup,restore,archive,list,export}
                            Available actions
        config              Configuration options
        backup              Backup options
        restore             Restore options
        archive             Archive options
        list                List options
+       export              Export options
 
 Valid action
 
@@ -126,6 +129,7 @@ Valid action
 * **restore**: transactions that call rsync for pushing files to a client.
 * **archive**: transaction that zip old backups and move them to a new destination.
 * **list**: query the catalog.
+* **export**: export a single backup to other path.
 
 It also has three flags that can be very useful, especially in case of error.
 
@@ -148,7 +152,7 @@ Let's see how to go about looking at the help:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --help
+   arthur@heartofgold$ bb config --help
    usage: bb config [-h] [--verbose] [--log] [--dry-run] [--new | --remove]
                     [--deploy DEPLOY_HOST] [--user DEPLOY_USER]
 
@@ -181,7 +185,7 @@ At this point, we create the configuration:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --new
+   arthur@heartofgold$ bb config --new
    WARNING: Private key ~/.ssh/id_rsa exists
    If you want to use the existing key, run "bb config --deploy name_of_machine", otherwise to remove it, run "bb config --remove"
 
@@ -189,10 +193,10 @@ In this case, the RSA key already exists. Now try delete and create a new keys:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --remove
+   arthur@heartofgold$ bb config --remove
    Are you sure to remove existing rsa keys? To continue [Y/N]? y
    SUCCESS: Removed configuration successfully!
-   arthur@goldenheart$ bb config --new
+   arthur@heartofgold$ bb config --new
    SUCCESS: New configuration successfully created!
 
 Once you have created the configuration, keys should be installed (copied) on the hosts you 
@@ -200,8 +204,7 @@ want to backup.
 
 .. code-block:: bash
 
-   "
-   arthur@goldenheart$ bb config --deploy host1
+   arthur@heartofgold$ bb config --deploy host1
    Copying configuration to host1; write the password:
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/arthur/.ssh/id_rsa.pub"
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
@@ -214,14 +217,13 @@ want to backup.
    and check to make sure that only the key(s) you wanted were added.
 
    SUCCESS: Configuration copied successfully on host1!
-   "
 
 This command will try to copy the configuration with the current user.
 If you want to use a different user (e.g.: root), run this:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --deploy host1 --user root
+   arthur@heartofgold$ bb config --deploy host1 --user root
    "Copying configuration to host1; write the password:"
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/arthur/.ssh/id_rsa.pub"
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
@@ -269,7 +271,7 @@ Download https://cygwin.com/ cygwin and follow this instructions to install the
 
    C:
    chdir C:\cygwin\bin
-   mkpasswd -l > C:\cygwin\etc\passwd
+   mkpasswd -cl > C:\cygwin\etc\passwd
    bash ssh-host-config -y
    cygrunsrv -S sshd
 
@@ -287,10 +289,10 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --help
+   arthur@heartofgold$ bb backup --help
    usage: bb backup [-h] [--verbose] [--log] [--dry-run]
                     (--computer HOSTNAME | --list LIST) --destination DESTINATION
-                    [--mode {Full,Incremental,Mirror}]
+                    [--mode {Full,Incremental,Differential,Mirror}]
                     (--data {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...] | --custom-data CUSTOMDATA [CUSTOMDATA ...])
                     [--user USER] --type {Unix,Windows,MacOS} [--compress]
                     [--retention RETENTION] [--parallel PARALLEL]
@@ -308,7 +310,7 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
      --list LIST, -L LIST  File list of computers or ip addresses to backup
      --destination DESTINATION, -d DESTINATION
                            Destination path
-     --mode {Full,Incremental,Mirror}, -m {Full,Incremental,Mirror}
+     --mode {Full,Incremental,Differential,Mirror}, -m {Full,Incremental,Differential,Mirror}
                            Backup mode
      --data {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...], -D {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...]
                            Data of which you want to backup
@@ -325,6 +327,8 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
                            Number of parallel jobs
      --timeout TIMEOUT, -T TIMEOUT
                            I/O timeout in seconds
+     --skip-error, -e      Skip error
+
 
 
 * **Backup options**
@@ -340,13 +344,19 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
                            host2
 
                            ...
-   --destination           Select the destination folder (root).
+   --destination, -d       Select the destination folder (root).
    --mode, -m              Select how rsync perform backup:
 
-    * Full: Complete (full) backup.
-    * Incremental: Incremental backup is based on the latest Full (the same files are linked with hard link).
+    * Full:
+         Complete (full) backup.
+    * Incremental:
+         Incremental backup is based on the latest backup (the same files are linked with hard link).
+         A Full backup is executed if this mode fails to find one.
+    * Differential:
+         Incremental backup is based on the latest Full backup (the same files are linked with hard link).
          A Full backup is executed if this mode fails to find one.
-    * Mirror: Complete mirror backup. If a file in the source no longer exists, BB deletes it from the destination.
+    * Mirror:
+         Complete mirror backup. If a file in the source no longer exists, BB deletes it from the destination.
    --data, -D              Select the type of data to put under backup:
        The values change depending on the type of operating system:
 
@@ -366,6 +376,23 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
    --retention, -r         Number of days for which you want to keep your backups.
    --parallel, -p          Maximum number of concurrent rsync processes. By default is 5 jobs.
    --timeout, -T           Specify number of seconds of I/O timeout.
+   --skip-error, -e        Skip error. Quiet mode.
+
+Flowchart of the differences between Differential and Incremental backup::
+
+   +----------+   +----------+   +----------+
+   |          |   |          |   |          |
+   |   Full   | <-+   Inc.   | <-+   Inc.   |
+   |          |   |          |   |          |
+   +----------+   +----------+   +----------+
+
+   +----------+   +----------+   +----------+
+   |          |   |          |   |          |
+   |   Full   | <-+   Dif.   |   |   Dif.   |
+   |          |   |          |   |          |
+   +----+-----+   +----------+   +----+-----+
+        ^                             |
+        +-----------------------------+
 
 
 .. _backup_computer:
@@ -380,7 +407,7 @@ This is a few examples:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
+   arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
    # host1 SSH-2.0-OpenSSH_7.5
    # host1 SSH-2.0-OpenSSH_7.5
    Start backup on host1
@@ -392,14 +419,14 @@ This is a few examples:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --mode Full --data User Config --type MacOS --user root
+   arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --mode Full --data User Config --type MacOS --user root
    "root@host1's password:"
    Start backup on host1
    SUCCESS: Command rsync -ah --no-links root@host1:/Users :/private/etc /mnt/backup/host1/2018_08_08__10_30
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS --verbose --log
+   arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS --verbose --log
    INFO: Build a rsync command
    INFO: Last full is 2018-08-08 10:30:32
    INFO: Command flags are: rsync -ahu --no-links --link-dest=/mnt/backup/host1/2018_08_08__10_28 -vP
@@ -433,7 +460,7 @@ This is a few examples:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS
+   arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS
    # host1 SSH-2.0-OpenSSH_7.5
    # host1 SSH-2.0-OpenSSH_7.5
    ERROR: The port 22 on host2 is closed!
@@ -452,7 +479,7 @@ This means that maximum two backup jobs will run at the same time. When a first
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --log
+   arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --log
    # host1 SSH-2.0-OpenSSH_7.5
    # host1 SSH-2.0-OpenSSH_7.5
    ERROR: The port 22 on host2 is closed!
@@ -464,7 +491,7 @@ This is the same example but specifying a retention at 3 (days). This means that
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --retention 3 --log --verbose
+   arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --retention 3 --log --verbose
    INFO: Build a rsync command
    INFO: Last full is 2018-08-08 10:30:32
    INFO: Command flags are: rsync -ahu --no-links --link-dest=/mnt/backup/host1/2018_08_08__10_30 -vP
@@ -504,9 +531,10 @@ To query this catalog, the list command exists.
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --help
+   arthur@heartofgold$ bb list --help
    usage: bb list [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
-                  [--backup-id ID] [--archived] [--cleaned]
+                  [--backup-id ID | --archived | --cleaned | --computer HOSTNAME]
+                  [--oneline]
 
    optional arguments:
      -h, --help            show this help message and exit
@@ -521,18 +549,24 @@ To query this catalog, the list command exists.
                            Backup-id of backup
      --archived, -a        List only archived backup
      --cleaned, -c         List only cleaned backup
+     --computer HOSTNAME, -H HOSTNAME
+                           List only match hostname or ip
+     --oneline, -o         One line output
+
 
 * **List options**
    --catalog, -C           Select the backups folder (root).
    --backup-id, -i         Select backup id in the catalog.
    --archived, -a          List only archived backups.
    --cleaned, -c           List only cleaned backups.
+   --computer, -H          List only match hostname or ip.
+   --oneline, -o           One line and concise output.
 
 First, let's query the catalog:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup
+   arthur@heartofgold$ bb list --catalog /mnt/backup
 
    BUTTERFLY BACKUP CATALOG
 
@@ -552,7 +586,7 @@ Press ``q`` for exit. Then we select a backup-id:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
+   arthur@heartofgold$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
    Backup id: dd6de2f2-9a1e-11e8-82b0-005056a664e0
    Hostname or ip: host1
    Type: Incremental
@@ -570,8 +604,8 @@ If you want to export the catalog list instead, include the log flag:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup --log
-   arthur@goldenheart$ cat /mnt/backup/backup.list
+   arthur@heartofgold$ bb list --catalog /mnt/backup --log
+   arthur@heartofgold$ cat /mnt/backup/backup.list
 
 Now that we have identified a backup, let's proceed with the restore
 
@@ -585,7 +619,7 @@ The restore process is the exact opposite of the backup process. It takes the fi
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --help
+   arthur@heartofgold$ bb restore --help
    usage: bb restore [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
                      (--backup-id ID | --last) [--user USER] --computer HOSTNAME
                      [--type {Unix,Windows,MacOS}] [--timeout TIMEOUT] [--mirror]
@@ -611,6 +645,7 @@ The restore process is the exact opposite of the backup process. It takes the fi
      --timeout TIMEOUT, -T TIMEOUT
                            I/O timeout in seconds
      --mirror, -m          Mirror mode
+     --skip-error, -e      Skip error
 
 * **Restore options**
    --catalog, -C           Select the backups folder (root).
@@ -626,6 +661,8 @@ The restore process is the exact opposite of the backup process. It takes the fi
 
    --timeout, -T           Specify number of seconds of I/O timeout.
    --mirror, -m            Mirror mode. If a file or folder not exist in destination, will delete it. Overwrite files.
+   --skip-error, -e        Skip error. Quiet mode.
+
 
 This is a few examples:
 
@@ -633,7 +670,7 @@ This command perform a restore on the same machine of the backup:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
+   arthur@heartofgold$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/etc? To continue [Y/N]? y
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/Users? To continue [Y/N]? y
    SUCCESS: Command rsync -ahu -vP --log-file=/mnt/backup/host1/2018_08_08__10_58/restore.log /mnt/backup/host1/2018_08_08__10_58/etc arthur@host1:/restore_2018_08_08__10_58
@@ -647,7 +684,7 @@ Now, select the last available backup on catalog; run this:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --catalog /mnt/backup --last --computer host1 --log
+   arthur@heartofgold$ bb restore --catalog /mnt/backup --last --computer host1 --log
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/etc? To continue [Y/N]? y
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/Users? To continue [Y/N]? y
    SUCCESS: Command rsync -ahu -vP --log-file=/mnt/backup/host1/2018_08_08__10_58/restore.log /mnt/backup/host1/2018_08_08__10_58/etc arthur@host1:/restore_2018_08_08__10_59
@@ -657,7 +694,7 @@ This example, is the same as the previous one, but restore to other machine and
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host2 --type Unix --log --verbose
+   arthur@heartofgold$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host2 --type Unix --log --verbose
    INFO: Build a rsync command
    INFO: Command flags are: rsync -ahu -vP --log-file=/mnt/backup/host1/2018_08_08__10_58/restore.log
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/etc? To continue [Y/N]? y
@@ -687,7 +724,7 @@ Archive operations are used to store backups by saving disk space. Backups older
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb archive --help
+   arthur@heartofgold$ bb archive --help
    usage: bb archive [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
                      [--days DAYS] --destination DESTINATION
 
@@ -708,20 +745,20 @@ Archive operations are used to store backups by saving disk space. Backups older
 * **Archive options**
    --catalog, -C           Select the backups folder (root).
    --days, -D              Number of days for which you want to keep your backups. Default is 30.
-   --destination           New destination for compress zipped backup.
+   --destination, -d       New destination for compress zipped backup.
 
 Archive old backup of 3 days:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb archive --catalog /mnt/backup/ --days 3 --destination /mnt/archive/ --verbose --log
+   arthur@heartofgold$ bb archive --catalog /mnt/backup/ --days 3 --destination /mnt/archive/ --verbose --log
    INFO: Check archive this backup f65e5afe-9734-11e8-b0bb-005056a664e0. Folder /mnt/backup/host2/2018_08_08__17_50
    INFO: Check archive this backup 4f2b5f6e-9939-11e8-9ab6-005056a664e0. Folder /mnt/backup/host2/2018_08_04__07_26
    SUCCESS: Delete /mnt/backup/host2/2018_08_04__07_26 successfully.
    SUCCESS: Archive /mnt/backup/host2/2018_08_04__07_26 successfully.
-   arthur@goldenheart$ ls /mnt/archive
+   arthur@heartofgold$ ls /mnt/archive
    host1
-   arthur@goldenheart$ ls /mnt/archive/host1
+   arthur@heartofgold$ ls /mnt/archive/host1
    2018_08_06__07_26.zip
 
 The backup-id *f65e5afe-9734-11e8-b0bb-005056a664e0* it is not considered, because it falls within the established time.
@@ -731,7 +768,7 @@ Lastly, let's look in the catalog and see that the backup was actually archived:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup/ -i 4f2b5f6e-9939-11e8-9ab6-005056a664e0
+   arthur@heartofgold$ bb list --catalog /mnt/backup/ -i 4f2b5f6e-9939-11e8-9ab6-005056a664e0
    Backup id: 4f2b5f6e-9939-11e8-9ab6-005056a664e0
    Hostname or ip: host2
    Type: Incremental
@@ -742,3 +779,76 @@ Lastly, let's look in the catalog and see that the backup was actually archived:
    ExitCode: 0
    Path: /mnt/backup/host2/2018_08_04__07_26
    Archived: True
+
+.. _export:
+
+######
+Export
+######
+
+The export function is used to copy a particular backup to another path.
+
+.. code-block:: bash
+
+   arthur@heartofgold$ bb export -h
+   usage: bb export [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
+                    --backup-id ID --destination DESTINATION [--mirror] [--cut]
+                    [--include INCLUDE [INCLUDE ...]]
+                    [--exclude EXCLUDE [EXCLUDE ...]] [--timeout TIMEOUT]
+                    [--skip-error]
+
+   optional arguments:
+     -h, --help            show this help message and exit
+     --verbose, -v         Enable verbosity
+     --log, -l             Create a log
+     --dry-run, -N         Dry run mode
+
+   Export options:
+     --catalog CATALOG, -C CATALOG
+                           Folder where is catalog file
+     --backup-id ID, -i ID
+                           Backup-id of backup
+     --destination DESTINATION, -d DESTINATION
+                           Destination path
+     --mirror, -m          Mirror mode
+     --cut, -c             Cut mode. Delete source
+     --include INCLUDE [INCLUDE ...], -I INCLUDE [INCLUDE ...]
+                           Include pattern
+     --exclude EXCLUDE [EXCLUDE ...], -E EXCLUDE [EXCLUDE ...]
+                           Exclude pattern
+     --timeout TIMEOUT, -T TIMEOUT
+                           I/O timeout in seconds
+     --skip-error, -e      Skip error
+
+* **Export options**
+   --catalog, -C           Select the backups folder (root).
+   --backup-id, -i         Select backup id in the catalog.
+   --destination, -d       Destination path than export a backup.
+   --mirror, -m            Mirror mode.
+   --cut, -c               Cut mode. Delete source. Like a move function.
+   --include, -I           Include pattern. Accept wildcard character.
+   --exclude, -E           Exclude pattern. Accept wildcard character.
+   --timeout, -T           Specify number of seconds of I/O timeout.
+   --skip-error, -e        Skip error. Quiet mode.
+
+Export a backup in other directory:
+
+.. code-block:: bash
+
+   arthur@heartofgold$ bb export --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /mnt/backup/export --verbose
+   INFO: Export backup with id f0f700e8-0435-11e9-9e78-005056a664e0
+   INFO: Build a rsync command
+   Start export host1
+   INFO: rsync command: rsync -ah --no-links -vP /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+   SUCCESS: Command rsync -ah --no-links -vP /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+
+Export a backup with exclude pdf files:
+
+.. code-block:: bash
+
+   arthur@heartofgold$ bb export --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /backup/export --verbose --exclude *.pdf
+   INFO: Export backup with id f0f700e8-0435-11e9-9e78-005056a664e0
+   INFO: Build a rsync command
+   Start export host1
+   INFO: rsync command: rsync -ah --no-links -vP --exclude=*.pdf /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+   SUCCESS: Command rsync -ah --no-links -vP --exclude=*.pdf /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
diff --git a/docs/build/html/_static/ajax-loader.gif b/docs/build/html/_static/ajax-loader.gif
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/alabaster.css b/docs/build/html/_static/alabaster.css
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/basic.css b/docs/build/html/_static/basic.css
old mode 100644
new mode 100755
index 19ced10..104f076
--- a/docs/build/html/_static/basic.css
+++ b/docs/build/html/_static/basic.css
@@ -81,6 +81,10 @@ div.sphinxsidebar input {
     font-size: 1em;
 }
 
+div.sphinxsidebar #searchbox form.search {
+    overflow: hidden;
+}
+
 div.sphinxsidebar #searchbox input[type="text"] {
     float: left;
     width: 80%;
@@ -427,6 +431,13 @@ table.field-list td, table.field-list th {
     hyphens: manual;
 }
 
+/* -- hlist styles ---------------------------------------------------------- */
+
+table.hlist td {
+    vertical-align: top;
+}
+
+
 /* -- other body styles ----------------------------------------------------- */
 
 ol.arabic {
diff --git a/docs/build/html/_static/comment-bright.png b/docs/build/html/_static/comment-bright.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/comment-close.png b/docs/build/html/_static/comment-close.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/comment.png b/docs/build/html/_static/comment.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/custom.css b/docs/build/html/_static/custom.css
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/doctools.js b/docs/build/html/_static/doctools.js
old mode 100644
new mode 100755
index d892892..ffadbec
--- a/docs/build/html/_static/doctools.js
+++ b/docs/build/html/_static/doctools.js
@@ -150,7 +150,9 @@ var Documentation = {
     this.fixFirefoxAnchorBug();
     this.highlightSearchWords();
     this.initIndexTable();
-    
+    if (DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) {
+      this.initOnKeyListeners();
+    }
   },
 
   /**
@@ -310,4 +312,4 @@ _ = Documentation.gettext;
 
 $(document).ready(function() {
   Documentation.init();
-});
\ No newline at end of file
+});
diff --git a/docs/build/html/_static/documentation_options.js b/docs/build/html/_static/documentation_options.js
old mode 100644
new mode 100755
index 87ce200..b81190b
--- a/docs/build/html/_static/documentation_options.js
+++ b/docs/build/html/_static/documentation_options.js
@@ -5,5 +5,292 @@ var DOCUMENTATION_OPTIONS = {
     COLLAPSE_INDEX: false,
     FILE_SUFFIX: '.html',
     HAS_SOURCE: true,
-    SOURCELINK_SUFFIX: '.txt'
-};
\ No newline at end of file
+    SOURCELINK_SUFFIX: '.txt',
+    NAVIGATION_WITH_KEYS: false,
+    SEARCH_LANGUAGE_STOP_WORDS: ["a","and","are","as","at","be","but","by","for","if","in","into","is","it","near","no","not","of","on","or","such","that","the","their","then","there","these","they","this","to","was","will","with"]
+};
+
+
+
+/* Non-minified version JS is _stemmer.js if file is provided */ 
+/**
+ * Porter Stemmer
+ */
+var Stemmer = function() {
+
+  var step2list = {
+    ational: 'ate',
+    tional: 'tion',
+    enci: 'ence',
+    anci: 'ance',
+    izer: 'ize',
+    bli: 'ble',
+    alli: 'al',
+    entli: 'ent',
+    eli: 'e',
+    ousli: 'ous',
+    ization: 'ize',
+    ation: 'ate',
+    ator: 'ate',
+    alism: 'al',
+    iveness: 'ive',
+    fulness: 'ful',
+    ousness: 'ous',
+    aliti: 'al',
+    iviti: 'ive',
+    biliti: 'ble',
+    logi: 'log'
+  };
+
+  var step3list = {
+    icate: 'ic',
+    ative: '',
+    alize: 'al',
+    iciti: 'ic',
+    ical: 'ic',
+    ful: '',
+    ness: ''
+  };
+
+  var c = "[^aeiou]";          // consonant
+  var v = "[aeiouy]";          // vowel
+  var C = c + "[^aeiouy]*";    // consonant sequence
+  var V = v + "[aeiou]*";      // vowel sequence
+
+  var mgr0 = "^(" + C + ")?" + V + C;                      // [C]VC... is m>0
+  var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$";    // [C]VC[V] is m=1
+  var mgr1 = "^(" + C + ")?" + V + C + V + C;              // [C]VCVC... is m>1
+  var s_v   = "^(" + C + ")?" + v;                         // vowel in stem
+
+  this.stemWord = function (w) {
+    var stem;
+    var suffix;
+    var firstch;
+    var origword = w;
+
+    if (w.length < 3)
+      return w;
+
+    var re;
+    var re2;
+    var re3;
+    var re4;
+
+    firstch = w.substr(0,1);
+    if (firstch == "y")
+      w = firstch.toUpperCase() + w.substr(1);
+
+    // Step 1a
+    re = /^(.+?)(ss|i)es$/;
+    re2 = /^(.+?)([^s])s$/;
+
+    if (re.test(w))
+      w = w.replace(re,"$1$2");
+    else if (re2.test(w))
+      w = w.replace(re2,"$1$2");
+
+    // Step 1b
+    re = /^(.+?)eed$/;
+    re2 = /^(.+?)(ed|ing)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      re = new RegExp(mgr0);
+      if (re.test(fp[1])) {
+        re = /.$/;
+        w = w.replace(re,"");
+      }
+    }
+    else if (re2.test(w)) {
+      var fp = re2.exec(w);
+      stem = fp[1];
+      re2 = new RegExp(s_v);
+      if (re2.test(stem)) {
+        w = stem;
+        re2 = /(at|bl|iz)$/;
+        re3 = new RegExp("([^aeiouylsz])\\1$");
+        re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+        if (re2.test(w))
+          w = w + "e";
+        else if (re3.test(w)) {
+          re = /.$/;
+          w = w.replace(re,"");
+        }
+        else if (re4.test(w))
+          w = w + "e";
+      }
+    }
+
+    // Step 1c
+    re = /^(.+?)y$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      re = new RegExp(s_v);
+      if (re.test(stem))
+        w = stem + "i";
+    }
+
+    // Step 2
+    re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      suffix = fp[2];
+      re = new RegExp(mgr0);
+      if (re.test(stem))
+        w = stem + step2list[suffix];
+    }
+
+    // Step 3
+    re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      suffix = fp[2];
+      re = new RegExp(mgr0);
+      if (re.test(stem))
+        w = stem + step3list[suffix];
+    }
+
+    // Step 4
+    re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
+    re2 = /^(.+?)(s|t)(ion)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      re = new RegExp(mgr1);
+      if (re.test(stem))
+        w = stem;
+    }
+    else if (re2.test(w)) {
+      var fp = re2.exec(w);
+      stem = fp[1] + fp[2];
+      re2 = new RegExp(mgr1);
+      if (re2.test(stem))
+        w = stem;
+    }
+
+    // Step 5
+    re = /^(.+?)e$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      re = new RegExp(mgr1);
+      re2 = new RegExp(meq1);
+      re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+      if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
+        w = stem;
+    }
+    re = /ll$/;
+    re2 = new RegExp(mgr1);
+    if (re.test(w) && re2.test(w)) {
+      re = /.$/;
+      w = w.replace(re,"");
+    }
+
+    // and turn initial Y back to y
+    if (firstch == "y")
+      w = firstch.toLowerCase() + w.substr(1);
+    return w;
+  }
+}
+
+
+
+
+
+var splitChars = (function() {
+    var result = {};
+    var singles = [96, 180, 187, 191, 215, 247, 749, 885, 903, 907, 909, 930, 1014, 1648,
+         1748, 1809, 2416, 2473, 2481, 2526, 2601, 2609, 2612, 2615, 2653, 2702,
+         2706, 2729, 2737, 2740, 2857, 2865, 2868, 2910, 2928, 2948, 2961, 2971,
+         2973, 3085, 3089, 3113, 3124, 3213, 3217, 3241, 3252, 3295, 3341, 3345,
+         3369, 3506, 3516, 3633, 3715, 3721, 3736, 3744, 3748, 3750, 3756, 3761,
+         3781, 3912, 4239, 4347, 4681, 4695, 4697, 4745, 4785, 4799, 4801, 4823,
+         4881, 5760, 5901, 5997, 6313, 7405, 8024, 8026, 8028, 8030, 8117, 8125,
+         8133, 8181, 8468, 8485, 8487, 8489, 8494, 8527, 11311, 11359, 11687, 11695,
+         11703, 11711, 11719, 11727, 11735, 12448, 12539, 43010, 43014, 43019, 43587,
+         43696, 43713, 64286, 64297, 64311, 64317, 64319, 64322, 64325, 65141];
+    var i, j, start, end;
+    for (i = 0; i < singles.length; i++) {
+        result[singles[i]] = true;
+    }
+    var ranges = [[0, 47], [58, 64], [91, 94], [123, 169], [171, 177], [182, 184], [706, 709],
+         [722, 735], [741, 747], [751, 879], [888, 889], [894, 901], [1154, 1161],
+         [1318, 1328], [1367, 1368], [1370, 1376], [1416, 1487], [1515, 1519], [1523, 1568],
+         [1611, 1631], [1642, 1645], [1750, 1764], [1767, 1773], [1789, 1790], [1792, 1807],
+         [1840, 1868], [1958, 1968], [1970, 1983], [2027, 2035], [2038, 2041], [2043, 2047],
+         [2070, 2073], [2075, 2083], [2085, 2087], [2089, 2307], [2362, 2364], [2366, 2383],
+         [2385, 2391], [2402, 2405], [2419, 2424], [2432, 2436], [2445, 2446], [2449, 2450],
+         [2483, 2485], [2490, 2492], [2494, 2509], [2511, 2523], [2530, 2533], [2546, 2547],
+         [2554, 2564], [2571, 2574], [2577, 2578], [2618, 2648], [2655, 2661], [2672, 2673],
+         [2677, 2692], [2746, 2748], [2750, 2767], [2769, 2783], [2786, 2789], [2800, 2820],
+         [2829, 2830], [2833, 2834], [2874, 2876], [2878, 2907], [2914, 2917], [2930, 2946],
+         [2955, 2957], [2966, 2968], [2976, 2978], [2981, 2983], [2987, 2989], [3002, 3023],
+         [3025, 3045], [3059, 3076], [3130, 3132], [3134, 3159], [3162, 3167], [3170, 3173],
+         [3184, 3191], [3199, 3204], [3258, 3260], [3262, 3293], [3298, 3301], [3312, 3332],
+         [3386, 3388], [3390, 3423], [3426, 3429], [3446, 3449], [3456, 3460], [3479, 3481],
+         [3518, 3519], [3527, 3584], [3636, 3647], [3655, 3663], [3674, 3712], [3717, 3718],
+         [3723, 3724], [3726, 3731], [3752, 3753], [3764, 3772], [3774, 3775], [3783, 3791],
+         [3802, 3803], [3806, 3839], [3841, 3871], [3892, 3903], [3949, 3975], [3980, 4095],
+         [4139, 4158], [4170, 4175], [4182, 4185], [4190, 4192], [4194, 4196], [4199, 4205],
+         [4209, 4212], [4226, 4237], [4250, 4255], [4294, 4303], [4349, 4351], [4686, 4687],
+         [4702, 4703], [4750, 4751], [4790, 4791], [4806, 4807], [4886, 4887], [4955, 4968],
+         [4989, 4991], [5008, 5023], [5109, 5120], [5741, 5742], [5787, 5791], [5867, 5869],
+         [5873, 5887], [5906, 5919], [5938, 5951], [5970, 5983], [6001, 6015], [6068, 6102],
+         [6104, 6107], [6109, 6111], [6122, 6127], [6138, 6159], [6170, 6175], [6264, 6271],
+         [6315, 6319], [6390, 6399], [6429, 6469], [6510, 6511], [6517, 6527], [6572, 6592],
+         [6600, 6607], [6619, 6655], [6679, 6687], [6741, 6783], [6794, 6799], [6810, 6822],
+         [6824, 6916], [6964, 6980], [6988, 6991], [7002, 7042], [7073, 7085], [7098, 7167],
+         [7204, 7231], [7242, 7244], [7294, 7400], [7410, 7423], [7616, 7679], [7958, 7959],
+         [7966, 7967], [8006, 8007], [8014, 8015], [8062, 8063], [8127, 8129], [8141, 8143],
+         [8148, 8149], [8156, 8159], [8173, 8177], [8189, 8303], [8306, 8307], [8314, 8318],
+         [8330, 8335], [8341, 8449], [8451, 8454], [8456, 8457], [8470, 8472], [8478, 8483],
+         [8506, 8507], [8512, 8516], [8522, 8525], [8586, 9311], [9372, 9449], [9472, 10101],
+         [10132, 11263], [11493, 11498], [11503, 11516], [11518, 11519], [11558, 11567],
+         [11622, 11630], [11632, 11647], [11671, 11679], [11743, 11822], [11824, 12292],
+         [12296, 12320], [12330, 12336], [12342, 12343], [12349, 12352], [12439, 12444],
+         [12544, 12548], [12590, 12592], [12687, 12689], [12694, 12703], [12728, 12783],
+         [12800, 12831], [12842, 12880], [12896, 12927], [12938, 12976], [12992, 13311],
+         [19894, 19967], [40908, 40959], [42125, 42191], [42238, 42239], [42509, 42511],
+         [42540, 42559], [42592, 42593], [42607, 42622], [42648, 42655], [42736, 42774],
+         [42784, 42785], [42889, 42890], [42893, 43002], [43043, 43055], [43062, 43071],
+         [43124, 43137], [43188, 43215], [43226, 43249], [43256, 43258], [43260, 43263],
+         [43302, 43311], [43335, 43359], [43389, 43395], [43443, 43470], [43482, 43519],
+         [43561, 43583], [43596, 43599], [43610, 43615], [43639, 43641], [43643, 43647],
+         [43698, 43700], [43703, 43704], [43710, 43711], [43715, 43738], [43742, 43967],
+         [44003, 44015], [44026, 44031], [55204, 55215], [55239, 55242], [55292, 55295],
+         [57344, 63743], [64046, 64047], [64110, 64111], [64218, 64255], [64263, 64274],
+         [64280, 64284], [64434, 64466], [64830, 64847], [64912, 64913], [64968, 65007],
+         [65020, 65135], [65277, 65295], [65306, 65312], [65339, 65344], [65371, 65381],
+         [65471, 65473], [65480, 65481], [65488, 65489], [65496, 65497]];
+    for (i = 0; i < ranges.length; i++) {
+        start = ranges[i][0];
+        end = ranges[i][1];
+        for (j = start; j <= end; j++) {
+            result[j] = true;
+        }
+    }
+    return result;
+})();
+
+function splitQuery(query) {
+    var result = [];
+    var start = -1;
+    for (var i = 0; i < query.length; i++) {
+        if (splitChars[query.charCodeAt(i)]) {
+            if (start !== -1) {
+                result.push(query.slice(start, i));
+                start = -1;
+            }
+        } else if (start === -1) {
+            start = i;
+        }
+    }
+    if (start !== -1) {
+        result.push(query.slice(start));
+    }
+    return result;
+}
+
+
diff --git a/docs/build/html/_static/down-pressed.png b/docs/build/html/_static/down-pressed.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/down.png b/docs/build/html/_static/down.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/file.png b/docs/build/html/_static/file.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/jquery-3.2.1.js b/docs/build/html/_static/jquery-3.2.1.js
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/jquery.js b/docs/build/html/_static/jquery.js
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/minus.png b/docs/build/html/_static/minus.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/plus.png b/docs/build/html/_static/plus.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/pygments.css b/docs/build/html/_static/pygments.css
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/searchtools.js b/docs/build/html/_static/searchtools.js
old mode 100644
new mode 100755
index 41b8336..7473859
--- a/docs/build/html/_static/searchtools.js
+++ b/docs/build/html/_static/searchtools.js
@@ -1,5 +1,5 @@
 /*
- * searchtools.js_t
+ * searchtools.js
  * ~~~~~~~~~~~~~~~~
  *
  * Sphinx JavaScript utilities for the full-text search.
@@ -9,323 +9,44 @@
  *
  */
 
-
-/* Non-minified version JS is _stemmer.js if file is provided */ 
-/**
- * Porter Stemmer
- */
-var Stemmer = function() {
-
-  var step2list = {
-    ational: 'ate',
-    tional: 'tion',
-    enci: 'ence',
-    anci: 'ance',
-    izer: 'ize',
-    bli: 'ble',
-    alli: 'al',
-    entli: 'ent',
-    eli: 'e',
-    ousli: 'ous',
-    ization: 'ize',
-    ation: 'ate',
-    ator: 'ate',
-    alism: 'al',
-    iveness: 'ive',
-    fulness: 'ful',
-    ousness: 'ous',
-    aliti: 'al',
-    iviti: 'ive',
-    biliti: 'ble',
-    logi: 'log'
-  };
-
-  var step3list = {
-    icate: 'ic',
-    ative: '',
-    alize: 'al',
-    iciti: 'ic',
-    ical: 'ic',
-    ful: '',
-    ness: ''
+if (!Scorer) {
+  /**
+   * Simple result scoring code.
+   */
+  var Scorer = {
+    // Implement the following function to further tweak the score for each result
+    // The function takes a result array [filename, title, anchor, descr, score]
+    // and returns the new score.
+    /*
+    score: function(result) {
+      return result[4];
+    },
+    */
+
+    // query matches the full name of an object
+    objNameMatch: 11,
+    // or matches in the last dotted part of the object name
+    objPartialMatch: 6,
+    // Additive scores depending on the priority of the object
+    objPrio: {0:  15,   // used to be importantResults
+              1:  5,   // used to be objectResults
+              2: -5},  // used to be unimportantResults
+    //  Used when the priority is not in the mapping.
+    objPrioDefault: 0,
+
+    // query found in title
+    title: 15,
+    // query found in terms
+    term: 5
   };
-
-  var c = "[^aeiou]";          // consonant
-  var v = "[aeiouy]";          // vowel
-  var C = c + "[^aeiouy]*";    // consonant sequence
-  var V = v + "[aeiou]*";      // vowel sequence
-
-  var mgr0 = "^(" + C + ")?" + V + C;                      // [C]VC... is m>0
-  var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$";    // [C]VC[V] is m=1
-  var mgr1 = "^(" + C + ")?" + V + C + V + C;              // [C]VCVC... is m>1
-  var s_v   = "^(" + C + ")?" + v;                         // vowel in stem
-
-  this.stemWord = function (w) {
-    var stem;
-    var suffix;
-    var firstch;
-    var origword = w;
-
-    if (w.length < 3)
-      return w;
-
-    var re;
-    var re2;
-    var re3;
-    var re4;
-
-    firstch = w.substr(0,1);
-    if (firstch == "y")
-      w = firstch.toUpperCase() + w.substr(1);
-
-    // Step 1a
-    re = /^(.+?)(ss|i)es$/;
-    re2 = /^(.+?)([^s])s$/;
-
-    if (re.test(w))
-      w = w.replace(re,"$1$2");
-    else if (re2.test(w))
-      w = w.replace(re2,"$1$2");
-
-    // Step 1b
-    re = /^(.+?)eed$/;
-    re2 = /^(.+?)(ed|ing)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      re = new RegExp(mgr0);
-      if (re.test(fp[1])) {
-        re = /.$/;
-        w = w.replace(re,"");
-      }
-    }
-    else if (re2.test(w)) {
-      var fp = re2.exec(w);
-      stem = fp[1];
-      re2 = new RegExp(s_v);
-      if (re2.test(stem)) {
-        w = stem;
-        re2 = /(at|bl|iz)$/;
-        re3 = new RegExp("([^aeiouylsz])\\1$");
-        re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
-        if (re2.test(w))
-          w = w + "e";
-        else if (re3.test(w)) {
-          re = /.$/;
-          w = w.replace(re,"");
-        }
-        else if (re4.test(w))
-          w = w + "e";
-      }
-    }
-
-    // Step 1c
-    re = /^(.+?)y$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      re = new RegExp(s_v);
-      if (re.test(stem))
-        w = stem + "i";
-    }
-
-    // Step 2
-    re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      suffix = fp[2];
-      re = new RegExp(mgr0);
-      if (re.test(stem))
-        w = stem + step2list[suffix];
-    }
-
-    // Step 3
-    re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      suffix = fp[2];
-      re = new RegExp(mgr0);
-      if (re.test(stem))
-        w = stem + step3list[suffix];
-    }
-
-    // Step 4
-    re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
-    re2 = /^(.+?)(s|t)(ion)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      re = new RegExp(mgr1);
-      if (re.test(stem))
-        w = stem;
-    }
-    else if (re2.test(w)) {
-      var fp = re2.exec(w);
-      stem = fp[1] + fp[2];
-      re2 = new RegExp(mgr1);
-      if (re2.test(stem))
-        w = stem;
-    }
-
-    // Step 5
-    re = /^(.+?)e$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      re = new RegExp(mgr1);
-      re2 = new RegExp(meq1);
-      re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
-      if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
-        w = stem;
-    }
-    re = /ll$/;
-    re2 = new RegExp(mgr1);
-    if (re.test(w) && re2.test(w)) {
-      re = /.$/;
-      w = w.replace(re,"");
-    }
-
-    // and turn initial Y back to y
-    if (firstch == "y")
-      w = firstch.toLowerCase() + w.substr(1);
-    return w;
-  }
 }
 
-
-
-/**
- * Simple result scoring code.
- */
-var Scorer = {
-  // Implement the following function to further tweak the score for each result
-  // The function takes a result array [filename, title, anchor, descr, score]
-  // and returns the new score.
-  /*
-  score: function(result) {
-    return result[4];
-  },
-  */
-
-  // query matches the full name of an object
-  objNameMatch: 11,
-  // or matches in the last dotted part of the object name
-  objPartialMatch: 6,
-  // Additive scores depending on the priority of the object
-  objPrio: {0:  15,   // used to be importantResults
-            1:  5,   // used to be objectResults
-            2: -5},  // used to be unimportantResults
-  //  Used when the priority is not in the mapping.
-  objPrioDefault: 0,
-
-  // query found in title
-  title: 15,
-  // query found in terms
-  term: 5
-};
-
-
-
-
-
-var splitChars = (function() {
-    var result = {};
-    var singles = [96, 180, 187, 191, 215, 247, 749, 885, 903, 907, 909, 930, 1014, 1648,
-         1748, 1809, 2416, 2473, 2481, 2526, 2601, 2609, 2612, 2615, 2653, 2702,
-         2706, 2729, 2737, 2740, 2857, 2865, 2868, 2910, 2928, 2948, 2961, 2971,
-         2973, 3085, 3089, 3113, 3124, 3213, 3217, 3241, 3252, 3295, 3341, 3345,
-         3369, 3506, 3516, 3633, 3715, 3721, 3736, 3744, 3748, 3750, 3756, 3761,
-         3781, 3912, 4239, 4347, 4681, 4695, 4697, 4745, 4785, 4799, 4801, 4823,
-         4881, 5760, 5901, 5997, 6313, 7405, 8024, 8026, 8028, 8030, 8117, 8125,
-         8133, 8181, 8468, 8485, 8487, 8489, 8494, 8527, 11311, 11359, 11687, 11695,
-         11703, 11711, 11719, 11727, 11735, 12448, 12539, 43010, 43014, 43019, 43587,
-         43696, 43713, 64286, 64297, 64311, 64317, 64319, 64322, 64325, 65141];
-    var i, j, start, end;
-    for (i = 0; i < singles.length; i++) {
-        result[singles[i]] = true;
-    }
-    var ranges = [[0, 47], [58, 64], [91, 94], [123, 169], [171, 177], [182, 184], [706, 709],
-         [722, 735], [741, 747], [751, 879], [888, 889], [894, 901], [1154, 1161],
-         [1318, 1328], [1367, 1368], [1370, 1376], [1416, 1487], [1515, 1519], [1523, 1568],
-         [1611, 1631], [1642, 1645], [1750, 1764], [1767, 1773], [1789, 1790], [1792, 1807],
-         [1840, 1868], [1958, 1968], [1970, 1983], [2027, 2035], [2038, 2041], [2043, 2047],
-         [2070, 2073], [2075, 2083], [2085, 2087], [2089, 2307], [2362, 2364], [2366, 2383],
-         [2385, 2391], [2402, 2405], [2419, 2424], [2432, 2436], [2445, 2446], [2449, 2450],
-         [2483, 2485], [2490, 2492], [2494, 2509], [2511, 2523], [2530, 2533], [2546, 2547],
-         [2554, 2564], [2571, 2574], [2577, 2578], [2618, 2648], [2655, 2661], [2672, 2673],
-         [2677, 2692], [2746, 2748], [2750, 2767], [2769, 2783], [2786, 2789], [2800, 2820],
-         [2829, 2830], [2833, 2834], [2874, 2876], [2878, 2907], [2914, 2917], [2930, 2946],
-         [2955, 2957], [2966, 2968], [2976, 2978], [2981, 2983], [2987, 2989], [3002, 3023],
-         [3025, 3045], [3059, 3076], [3130, 3132], [3134, 3159], [3162, 3167], [3170, 3173],
-         [3184, 3191], [3199, 3204], [3258, 3260], [3262, 3293], [3298, 3301], [3312, 3332],
-         [3386, 3388], [3390, 3423], [3426, 3429], [3446, 3449], [3456, 3460], [3479, 3481],
-         [3518, 3519], [3527, 3584], [3636, 3647], [3655, 3663], [3674, 3712], [3717, 3718],
-         [3723, 3724], [3726, 3731], [3752, 3753], [3764, 3772], [3774, 3775], [3783, 3791],
-         [3802, 3803], [3806, 3839], [3841, 3871], [3892, 3903], [3949, 3975], [3980, 4095],
-         [4139, 4158], [4170, 4175], [4182, 4185], [4190, 4192], [4194, 4196], [4199, 4205],
-         [4209, 4212], [4226, 4237], [4250, 4255], [4294, 4303], [4349, 4351], [4686, 4687],
-         [4702, 4703], [4750, 4751], [4790, 4791], [4806, 4807], [4886, 4887], [4955, 4968],
-         [4989, 4991], [5008, 5023], [5109, 5120], [5741, 5742], [5787, 5791], [5867, 5869],
-         [5873, 5887], [5906, 5919], [5938, 5951], [5970, 5983], [6001, 6015], [6068, 6102],
-         [6104, 6107], [6109, 6111], [6122, 6127], [6138, 6159], [6170, 6175], [6264, 6271],
-         [6315, 6319], [6390, 6399], [6429, 6469], [6510, 6511], [6517, 6527], [6572, 6592],
-         [6600, 6607], [6619, 6655], [6679, 6687], [6741, 6783], [6794, 6799], [6810, 6822],
-         [6824, 6916], [6964, 6980], [6988, 6991], [7002, 7042], [7073, 7085], [7098, 7167],
-         [7204, 7231], [7242, 7244], [7294, 7400], [7410, 7423], [7616, 7679], [7958, 7959],
-         [7966, 7967], [8006, 8007], [8014, 8015], [8062, 8063], [8127, 8129], [8141, 8143],
-         [8148, 8149], [8156, 8159], [8173, 8177], [8189, 8303], [8306, 8307], [8314, 8318],
-         [8330, 8335], [8341, 8449], [8451, 8454], [8456, 8457], [8470, 8472], [8478, 8483],
-         [8506, 8507], [8512, 8516], [8522, 8525], [8586, 9311], [9372, 9449], [9472, 10101],
-         [10132, 11263], [11493, 11498], [11503, 11516], [11518, 11519], [11558, 11567],
-         [11622, 11630], [11632, 11647], [11671, 11679], [11743, 11822], [11824, 12292],
-         [12296, 12320], [12330, 12336], [12342, 12343], [12349, 12352], [12439, 12444],
-         [12544, 12548], [12590, 12592], [12687, 12689], [12694, 12703], [12728, 12783],
-         [12800, 12831], [12842, 12880], [12896, 12927], [12938, 12976], [12992, 13311],
-         [19894, 19967], [40908, 40959], [42125, 42191], [42238, 42239], [42509, 42511],
-         [42540, 42559], [42592, 42593], [42607, 42622], [42648, 42655], [42736, 42774],
-         [42784, 42785], [42889, 42890], [42893, 43002], [43043, 43055], [43062, 43071],
-         [43124, 43137], [43188, 43215], [43226, 43249], [43256, 43258], [43260, 43263],
-         [43302, 43311], [43335, 43359], [43389, 43395], [43443, 43470], [43482, 43519],
-         [43561, 43583], [43596, 43599], [43610, 43615], [43639, 43641], [43643, 43647],
-         [43698, 43700], [43703, 43704], [43710, 43711], [43715, 43738], [43742, 43967],
-         [44003, 44015], [44026, 44031], [55204, 55215], [55239, 55242], [55292, 55295],
-         [57344, 63743], [64046, 64047], [64110, 64111], [64218, 64255], [64263, 64274],
-         [64280, 64284], [64434, 64466], [64830, 64847], [64912, 64913], [64968, 65007],
-         [65020, 65135], [65277, 65295], [65306, 65312], [65339, 65344], [65371, 65381],
-         [65471, 65473], [65480, 65481], [65488, 65489], [65496, 65497]];
-    for (i = 0; i < ranges.length; i++) {
-        start = ranges[i][0];
-        end = ranges[i][1];
-        for (j = start; j <= end; j++) {
-            result[j] = true;
-        }
-    }
-    return result;
-})();
-
-function splitQuery(query) {
-    var result = [];
-    var start = -1;
-    for (var i = 0; i < query.length; i++) {
-        if (splitChars[query.charCodeAt(i)]) {
-            if (start !== -1) {
-                result.push(query.slice(start, i));
-                start = -1;
-            }
-        } else if (start === -1) {
-            start = i;
-        }
-    }
-    if (start !== -1) {
-        result.push(query.slice(start));
-    }
-    return result;
+if (!splitQuery) {
+  function splitQuery(query) {
+    return query.split(/\s+/);
+  }
 }
 
-
-
-
 /**
  * Search Module
  */
@@ -417,7 +138,7 @@ var Search = {
    */
   query : function(query) {
     var i;
-    var stopwords = ["a","and","are","as","at","be","but","by","for","if","in","into","is","it","near","no","not","of","on","or","such","that","the","their","then","there","these","they","this","to","was","will","with"];
+    var stopwords = DOCUMENTATION_OPTIONS.SEARCH_LANGUAGE_STOP_WORDS;
 
     // stem the searchterms and add them to the correct list
     var stemmer = new Stemmer();
@@ -758,4 +479,4 @@ var Search = {
 
 $(document).ready(function() {
   Search.init();
-});
\ No newline at end of file
+});
diff --git a/docs/build/html/_static/underscore-1.3.1.js b/docs/build/html/_static/underscore-1.3.1.js
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/underscore.js b/docs/build/html/_static/underscore.js
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/up-pressed.png b/docs/build/html/_static/up-pressed.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/up.png b/docs/build/html/_static/up.png
old mode 100644
new mode 100755
diff --git a/docs/build/html/_static/websupport.js b/docs/build/html/_static/websupport.js
old mode 100644
new mode 100755
diff --git a/docs/build/html/genindex.html b/docs/build/html/genindex.html
old mode 100644
new mode 100755
index 7fe4e12..cdc858b
--- a/docs/build/html/genindex.html
+++ b/docs/build/html/genindex.html
@@ -25,8 +25,7 @@
 
   
 
-  
-    <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
+  <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
   <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <link rel="index" title="Index" href="#" />
     <link rel="search" title="Search" href="search.html" /> 
@@ -158,7 +157,7 @@ <h1 id="index">Index</h1>
 
   <div role="contentinfo">
     <p>
-        &copy; Copyright 2018, Matteo Guadrini &lt;matteo.guadrini@hotmail.it&gt;.
+        &copy; Copyright 2018, Matteo Guadrini &lt;matteo.guadrini@hotmail.it&gt;
 
     </p>
   </div>
@@ -177,27 +176,17 @@ <h1 id="index">Index</h1>
 
   
 
-    <script type="text/javascript">
-        var DOCUMENTATION_OPTIONS = {
-            URL_ROOT:'./',
-            VERSION:'1.0.0',
-            LANGUAGE:'None',
-            COLLAPSE_INDEX:false,
-            FILE_SUFFIX:'.html',
-            HAS_SOURCE:  true,
-            SOURCELINK_SUFFIX: '.txt'
-        };
-    </script>
-      <script type="text/javascript" src="_static/jquery.js"></script>
-      <script type="text/javascript" src="_static/underscore.js"></script>
-      <script type="text/javascript" src="_static/doctools.js"></script>
+    
+    
+      <script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
+        <script type="text/javascript" src="_static/jquery.js"></script>
+        <script type="text/javascript" src="_static/underscore.js"></script>
+        <script type="text/javascript" src="_static/doctools.js"></script>
+    
 
   
 
-  
-  
-    <script type="text/javascript" src="_static/js/theme.js"></script>
-  
+  <script type="text/javascript" src="_static/js/theme.js"></script>
 
   <script type="text/javascript">
       jQuery(function () {
diff --git a/docs/build/html/index.html b/docs/build/html/index.html
old mode 100644
new mode 100755
index e6be39a..e7c7877
--- a/docs/build/html/index.html
+++ b/docs/build/html/index.html
@@ -24,8 +24,7 @@
 
   
 
-  
-    <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
+  <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
   <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <link rel="index" title="Index" href="genindex.html" />
     <link rel="search" title="Search" href="search.html" /> 
@@ -98,6 +97,7 @@
 <li><a class="reference internal" href="#list">List</a></li>
 <li><a class="reference internal" href="#restore">Restore</a></li>
 <li><a class="reference internal" href="#archive">Archive</a></li>
+<li><a class="reference internal" href="#export">Export</a></li>
 </ul>
 </li>
 </ul>
@@ -178,6 +178,7 @@ <h2>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Pe
 <li><a class="reference internal" href="#list"><span class="std std-ref">List</span></a></li>
 <li><a class="reference internal" href="#restore"><span class="std std-ref">Restore</span></a></li>
 <li><a class="reference internal" href="#archive"><span class="std std-ref">Archive</span></a></li>
+<li><a class="reference internal" href="#export"><span class="std std-ref">Export</span></a></li>
 <li><a class="reference internal" href="search.html"><span class="std std-ref">Search Page</span></a></li>
 </ul>
 </div>
@@ -189,10 +190,11 @@ <h2>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Pe
 <div class="section" id="installation">
 <h3>Installation<a class="headerlink" href="#installation" title="Permalink to this headline">¶</a></h3>
 <p>Install Butterfly Backup is very simple; run this:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ git clone https://github.com/MatteoGuadrini/Butterfly-Backup.git
-arthur@goldenheart$ <span class="nb">cd</span> Butterfly-Backup
-arthur@goldenheart$ sudo python3 setup.py
-arthur@goldenheart$ bb --help
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ git clone https://github.com/MatteoGuadrini/Butterfly-Backup.git
+arthur@heartofgold$ <span class="nb">cd</span> Butterfly-Backup
+arthur@heartofgold$ sudo python3 setup.py
+arthur@heartofgold$ bb --help
+arthur@heartofgold$ man bb
 </pre></div>
 </div>
 <p>The upgrade is also simple; type the same commands.</p>
@@ -204,7 +206,7 @@ <h3>Installation<a class="headerlink" href="#installation" title="Permalink to t
 from where it will contact the clients on which it will perform the backup. Also for the restore the concept is the same;
 the server pushes files into the client.</p>
 <p>Backups are organized according to precise cataloguing; this is an example:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ tree destination/of/backup
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ tree destination/of/backup
 .
 ├── destination
 │   ├── hostname or ip of the PC under backup
@@ -235,10 +237,10 @@ <h3>Installation<a class="headerlink" href="#installation" title="Permalink to t
 <p class="first admonition-title">Important</p>
 <p class="last">Be careful to not delete <em>.catalog.cfg</em> file.</p>
 </div>
-<p>Backup butterfly has, in its core, five main operations:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb --help
+<p>Butterfly Backup has, in its core, six main operations:</p>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb --help
 usage: bb <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span> <span class="o">[</span>--log<span class="o">]</span> <span class="o">[</span>--dry-run<span class="o">]</span> <span class="o">[</span>--version<span class="o">]</span>
-          <span class="o">{</span>config,backup,restore,archive,list<span class="o">}</span> ...
+          <span class="o">{</span>config,backup,restore,archive,list,export<span class="o">}</span> ...
 
 Butterfly Backup
 
@@ -252,13 +254,14 @@ <h3>Installation<a class="headerlink" href="#installation" title="Permalink to t
 action:
   Valid action
 
-  <span class="o">{</span>config,backup,restore,archive,list<span class="o">}</span>
+  <span class="o">{</span>config,backup,restore,archive,list,export<span class="o">}</span>
                         Available actions
     config              Configuration options
     backup              Backup options
     restore             Restore options
     archive             Archive options
     list                List options
+    <span class="nb">export</span>              Export options
 </pre></div>
 </div>
 <p>Valid action</p>
@@ -268,6 +271,7 @@ <h3>Installation<a class="headerlink" href="#installation" title="Permalink to t
 <li><strong>restore</strong>: transactions that call rsync for pushing files to a client.</li>
 <li><strong>archive</strong>: transaction that zip old backups and move them to a new destination.</li>
 <li><strong>list</strong>: query the catalog.</li>
+<li><strong>export</strong>: export a single backup to other path.</li>
 </ul>
 <p>It also has three flags that can be very useful, especially in case of error.</p>
 <blockquote>
@@ -299,7 +303,7 @@ <h3>Installation<a class="headerlink" href="#installation" title="Permalink to t
 <p>Configuration mode is very simple; If you’re already familiar with the exchange keys and OpenSSH, you probably won’t need it.
 If you don’t want to discuss the merits of exchange keys and start, then go ahead. First, you must create a configuration (rsa keys).
 Let’s see how to go about looking at the help:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb config --help
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb config --help
 usage: bb config <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span> <span class="o">[</span>--log<span class="o">]</span> <span class="o">[</span>--dry-run<span class="o">]</span> <span class="o">[</span>--new <span class="p">|</span> --remove<span class="o">]</span>
                  <span class="o">[</span>--deploy DEPLOY_HOST<span class="o">]</span> <span class="o">[</span>--user DEPLOY_USER<span class="o">]</span>
 
@@ -362,41 +366,39 @@ <h3>Installation<a class="headerlink" href="#installation" title="Permalink to t
 </li>
 </ul>
 <p>At this point, we create the configuration:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb config --new
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb config --new
 WARNING: Private key ~/.ssh/id_rsa exists
 If you want to use the existing key, run <span class="s2">&quot;bb config --deploy name_of_machine&quot;</span>, otherwise to remove it, run <span class="s2">&quot;bb config --remove&quot;</span>
 </pre></div>
 </div>
 <p>In this case, the RSA key already exists. Now try delete and create a new keys:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb config --remove
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb config --remove
 Are you sure to remove existing rsa keys? To <span class="k">continue</span> <span class="o">[</span>Y/N<span class="o">]</span>? y
 SUCCESS: Removed configuration successfully!
-arthur@goldenheart$ bb config --new
+arthur@heartofgold$ bb config --new
 SUCCESS: New configuration successfully created!
 </pre></div>
 </div>
 <p>Once you have created the configuration, keys should be installed (copied) on the hosts you
 want to backup.</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="s2">&quot;</span>
-<span class="s2">arthur@goldenheart</span>$<span class="s2"> bb config --deploy host1</span>
-<span class="s2">Copying configuration to host1; write the password:</span>
-<span class="s2">/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: &quot;</span>/home/arthur/.ssh/id_rsa.pub<span class="s2">&quot;</span>
-<span class="s2">/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed</span>
-<span class="s2">/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys</span>
-<span class="s2">arthur@host1&#39;s password:</span>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb config --deploy host1
+Copying configuration to host1; write the password:
+/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: &quot;/home/arthur/.ssh/id_rsa.pub&quot;
+/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
+/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
+arthur@host1&#39;s password:
 
-<span class="s2">Number of key(s) added: 1</span>
+Number of key(s) added: 1
 
-<span class="s2">Now try logging into the machine, with:   &quot;</span>ssh <span class="s1">&#39;arthur@host1&#39;</span><span class="s2">&quot;</span>
-<span class="s2">and check to make sure that only the key(s) you wanted were added.</span>
+Now try logging into the machine, with:   &quot;ssh &#39;arthur@host1&#39;&quot;
+and check to make sure that only the key(s) you wanted were added.
 
-<span class="s2">SUCCESS: Configuration copied successfully on host1!</span>
-<span class="s2">&quot;</span>
+SUCCESS: Configuration copied successfully on host1!
 </pre></div>
 </div>
 <p>This command will try to copy the configuration with the current user.
 If you want to use a different user (e.g.: root), run this:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb config --deploy host1 --user root
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb config --deploy host1 --user root
 <span class="s2">&quot;Copying configuration to host1; write the password:&quot;</span>
 /usr/bin/ssh-copy-id: INFO: Source of key<span class="o">(</span>s<span class="o">)</span> to be installed: <span class="s2">&quot;/home/arthur/.ssh/id_rsa.pub&quot;</span>
 /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key<span class="o">(</span>s<span class="o">)</span>, to filter out any that are already installed
@@ -441,7 +443,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 
 C<span class="p">:</span>
 <span class="k">chdir</span> C:\cygwin\bin
-mkpasswd -l <span class="p">&gt;</span> C:\cygwin\etc\passwd
+mkpasswd -cl <span class="p">&gt;</span> C:\cygwin\etc\passwd
 bash ssh-host-config -y
 cygrunsrv -S sshd
 </pre></div>
@@ -452,10 +454,10 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <div class="section" id="backup">
 <span id="id3"></span><h2>Backup<a class="headerlink" href="#backup" title="Permalink to this headline">¶</a></h2>
 <p>There are two backup modes: single and bulk. Let’s see how to go about looking at the help:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --help
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --help
 usage: bb backup <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span> <span class="o">[</span>--log<span class="o">]</span> <span class="o">[</span>--dry-run<span class="o">]</span>
                  <span class="o">(</span>--computer HOSTNAME <span class="p">|</span> --list LIST<span class="o">)</span> --destination DESTINATION
-                 <span class="o">[</span>--mode <span class="o">{</span>Full,Incremental,Mirror<span class="o">}]</span>
+                 <span class="o">[</span>--mode <span class="o">{</span>Full,Incremental,Differential,Mirror<span class="o">}]</span>
                  <span class="o">(</span>--data <span class="o">{</span>User,Config,Application,System,Log<span class="o">}</span> <span class="o">[{</span>User,Config,Application,System,Log<span class="o">}</span> ...<span class="o">]</span> <span class="p">|</span> --custom-data CUSTOMDATA <span class="o">[</span>CUSTOMDATA ...<span class="o">])</span>
                  <span class="o">[</span>--user USER<span class="o">]</span> --type <span class="o">{</span>Unix,Windows,MacOS<span class="o">}</span> <span class="o">[</span>--compress<span class="o">]</span>
                  <span class="o">[</span>--retention RETENTION<span class="o">]</span> <span class="o">[</span>--parallel PARALLEL<span class="o">]</span>
@@ -473,7 +475,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
   --list LIST, -L LIST  File list of computers or ip addresses to backup
   --destination DESTINATION, -d DESTINATION
                         Destination path
-  --mode <span class="o">{</span>Full,Incremental,Mirror<span class="o">}</span>, -m <span class="o">{</span>Full,Incremental,Mirror<span class="o">}</span>
+  --mode <span class="o">{</span>Full,Incremental,Differential,Mirror<span class="o">}</span>, -m <span class="o">{</span>Full,Incremental,Differential,Mirror<span class="o">}</span>
                         Backup mode
   --data <span class="o">{</span>User,Config,Application,System,Log<span class="o">}</span> <span class="o">[{</span>User,Config,Application,System,Log<span class="o">}</span> ...<span class="o">]</span>, -D <span class="o">{</span>User,Config,Application,System,Log<span class="o">}</span> <span class="o">[{</span>User,Config,Application,System,Log<span class="o">}</span> ...<span class="o">]</span>
                         Data of which you want to backup
@@ -490,6 +492,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
                         Number of parallel <span class="nb">jobs</span>
   --timeout TIMEOUT, -T TIMEOUT
                         I/O timeout in seconds
+  --skip-error, -e      Skip error
 </pre></div>
 </div>
 <ul>
@@ -512,21 +515,37 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <p>host2</p>
 <p class="last">…</p>
 </td></tr>
-<tr><td class="option-group">
-<kbd><span class="option">--destination</span></kbd></td>
-<td><p class="first last">Select the destination folder (root).</p>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--destination</span>, <span class="option">-d</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">Select the destination folder (root).</p>
 </td></tr>
 <tr><td class="option-group">
 <kbd><span class="option">--mode</span>, <span class="option">-m</span></kbd></td>
 <td><p class="first">Select how rsync perform backup:</p>
 <ul class="last simple">
-<li>Full: Complete (full) backup.</li>
 <li><dl class="first docutils">
-<dt>Incremental: Incremental backup is based on the latest Full (the same files are linked with hard link).</dt>
-<dd>A Full backup is executed if this mode fails to find one.</dd>
+<dt>Full:</dt>
+<dd>Complete (full) backup.</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt>Incremental:</dt>
+<dd>Incremental backup is based on the latest backup (the same files are linked with hard link).
+A Full backup is executed if this mode fails to find one.</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt>Differential:</dt>
+<dd>Incremental backup is based on the latest Full backup (the same files are linked with hard link).
+A Full backup is executed if this mode fails to find one.</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt>Mirror:</dt>
+<dd>Complete mirror backup. If a file in the source no longer exists, BB deletes it from the destination.</dd>
 </dl>
 </li>
-<li>Mirror: Complete mirror backup. If a file in the source no longer exists, BB deletes it from the destination.</li>
 </ul>
 </td></tr>
 <tr><td class="option-group">
@@ -575,18 +594,39 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <kbd><span class="option">--timeout</span>, <span class="option">-T</span></kbd></td>
 <td><p class="first last">Specify number of seconds of I/O timeout.</p>
 </td></tr>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--skip-error</span>, <span class="option">-e</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">Skip error. Quiet mode.</p>
+</td></tr>
 </tbody>
 </table>
 </dd>
 </dl>
 </li>
 </ul>
+<p>Flowchart of the differences between Differential and Incremental backup:</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">+----------+</span>   <span class="o">+----------+</span>   <span class="o">+----------+</span>
+<span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>
+<span class="o">|</span>   <span class="n">Full</span>   <span class="o">|</span> <span class="o">&lt;-+</span>   <span class="n">Inc</span><span class="o">.</span>   <span class="o">|</span> <span class="o">&lt;-+</span>   <span class="n">Inc</span><span class="o">.</span>   <span class="o">|</span>
+<span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>
+<span class="o">+----------+</span>   <span class="o">+----------+</span>   <span class="o">+----------+</span>
+
+<span class="o">+----------+</span>   <span class="o">+----------+</span>   <span class="o">+----------+</span>
+<span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>
+<span class="o">|</span>   <span class="n">Full</span>   <span class="o">|</span> <span class="o">&lt;-+</span>   <span class="n">Dif</span><span class="o">.</span>   <span class="o">|</span>   <span class="o">|</span>   <span class="n">Dif</span><span class="o">.</span>   <span class="o">|</span>
+<span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>   <span class="o">|</span>          <span class="o">|</span>
+<span class="o">+----+-----+</span>   <span class="o">+----------+</span>   <span class="o">+----+-----+</span>
+     <span class="o">^</span>                             <span class="o">|</span>
+     <span class="o">+-----------------------------+</span>
+</pre></div>
+</div>
 <div class="section" id="single-backup">
 <span id="backup-computer"></span><h3>Single backup<a class="headerlink" href="#single-backup" title="Permalink to this headline">¶</a></h3>
 <p>The backup of a single machine consists in taking the files and folders indicated in the command line,
 and put them in the cataloging structure indicated above.</p>
 <p>This is a few examples:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
 <span class="c1"># host1 SSH-2.0-OpenSSH_7.5</span>
 <span class="c1"># host1 SSH-2.0-OpenSSH_7.5</span>
 Start backup on host1
@@ -597,13 +637,13 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <p class="first admonition-title">Important</p>
 <p class="last">Without specifying the “mode” flag, Butterfly Backup by default selects <em>Incremental</em> mode</p>
 </div>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --mode Full --data User Config --type MacOS --user root
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --mode Full --data User Config --type MacOS --user root
 <span class="s2">&quot;root@host1&#39;s password:&quot;</span>
 Start backup on host1
 SUCCESS: Command rsync -ah --no-links root@host1:/Users :/private/etc /mnt/backup/host1/2018_08_08__10_30
 </pre></div>
 </div>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS --verbose --log
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS --verbose --log
 INFO: Build a rsync <span class="nb">command</span>
 INFO: Last full is <span class="m">2018</span>-08-08 <span class="m">10</span>:30:32
 INFO: Command flags are: rsync -ahu --no-links --link-dest<span class="o">=</span>/mnt/backup/host1/2018_08_08__10_28 -vP
@@ -632,7 +672,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <span id="id4"></span><h3>Bulk backup<a class="headerlink" href="#bulk-backup" title="Permalink to this headline">¶</a></h3>
 <p>Bulk backup follows the same logic and the same options as a single backup, but accepts a file containing the names or ips of the machine to be backed up.</p>
 <p>This is a few examples:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS
 <span class="c1"># host1 SSH-2.0-OpenSSH_7.5</span>
 <span class="c1"># host1 SSH-2.0-OpenSSH_7.5</span>
 ERROR: The port <span class="m">22</span> on host2 is closed!
@@ -648,7 +688,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </div>
 <p>This example, is the same as the previous one, with the only difference being that the parallel flag is specified at 2.
 This means that maximum two backup jobs will run at the same time. When a first process ends, another one is started.</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel <span class="m">2</span> --log
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel <span class="m">2</span> --log
 <span class="c1"># host1 SSH-2.0-OpenSSH_7.5</span>
 <span class="c1"># host1 SSH-2.0-OpenSSH_7.5</span>
 ERROR: The port <span class="m">22</span> on host2 is closed!
@@ -658,7 +698,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </pre></div>
 </div>
 <p>This is the same example but specifying a retention at 3 (days). This means that in doing so we want to keep only 3 days backups.</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel <span class="m">2</span> --retention <span class="m">3</span> --log --verbose
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel <span class="m">2</span> --retention <span class="m">3</span> --log --verbose
 INFO: Build a rsync <span class="nb">command</span>
 INFO: Last full is <span class="m">2018</span>-08-08 <span class="m">10</span>:30:32
 INFO: Command flags are: rsync -ahu --no-links --link-dest<span class="o">=</span>/mnt/backup/host1/2018_08_08__10_30 -vP
@@ -692,9 +732,10 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <span id="id5"></span><h2>List<a class="headerlink" href="#list" title="Permalink to this headline">¶</a></h2>
 <p>When we run backup commands, a catalog is created. This serves both for future backups and all the restores that are made through Butterfly Backup.
 To query this catalog, the list command exists.</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb list --help
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb list --help
 usage: bb list <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span> <span class="o">[</span>--log<span class="o">]</span> <span class="o">[</span>--dry-run<span class="o">]</span> --catalog CATALOG
-               <span class="o">[</span>--backup-id ID<span class="o">]</span> <span class="o">[</span>--archived<span class="o">]</span> <span class="o">[</span>--cleaned<span class="o">]</span>
+               <span class="o">[</span>--backup-id ID <span class="p">|</span> --archived <span class="p">|</span> --cleaned <span class="p">|</span> --computer HOSTNAME<span class="o">]</span>
+               <span class="o">[</span>--oneline<span class="o">]</span>
 
 optional arguments:
   -h, --help            show this <span class="nb">help</span> message and <span class="nb">exit</span>
@@ -709,6 +750,9 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
                         Backup-id of backup
   --archived, -a        List only archived backup
   --cleaned, -c         List only cleaned backup
+  --computer HOSTNAME, -H HOSTNAME
+                        List only match hostname or ip
+  --oneline, -o         One line output
 </pre></div>
 </div>
 <ul>
@@ -735,6 +779,14 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <kbd><span class="option">--cleaned</span>, <span class="option">-c</span></kbd></td>
 <td><p class="first last">List only cleaned backups.</p>
 </td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--computer</span>, <span class="option">-H</span></kbd></td>
+<td><p class="first last">List only match hostname or ip.</p>
+</td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--oneline</span>, <span class="option">-o</span></kbd></td>
+<td><p class="first last">One line and concise output.</p>
+</td></tr>
 </tbody>
 </table>
 </dd>
@@ -742,7 +794,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </li>
 </ul>
 <p>First, let’s query the catalog:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb list --catalog /mnt/backup
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb list --catalog /mnt/backup
 
 BUTTERFLY BACKUP CATALOG
 
@@ -760,7 +812,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </pre></div>
 </div>
 <p>Press <code class="docutils literal notranslate"><span class="pre">q</span></code> for exit. Then we select a backup-id:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
 Backup id: dd6de2f2-9a1e-11e8-82b0-005056a664e0
 Hostname or ip: host1
 Type: Incremental
@@ -776,8 +828,8 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </pre></div>
 </div>
 <p>If you want to export the catalog list instead, include the log flag:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb list --catalog /mnt/backup --log
-arthur@goldenheart$ cat /mnt/backup/backup.list
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb list --catalog /mnt/backup --log
+arthur@heartofgold$ cat /mnt/backup/backup.list
 </pre></div>
 </div>
 <p>Now that we have identified a backup, let’s proceed with the restore</p>
@@ -785,7 +837,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <div class="section" id="restore">
 <span id="id6"></span><h2>Restore<a class="headerlink" href="#restore" title="Permalink to this headline">¶</a></h2>
 <p>The restore process is the exact opposite of the backup process. It takes the files from a specific backup and push it to the destination computer.</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb restore --help
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb restore --help
 usage: bb restore [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
                   (--backup-id ID | --last) [--user USER] --computer HOSTNAME
                   [--type {Unix,Windows,MacOS}] [--timeout TIMEOUT] [--mirror]
@@ -811,6 +863,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
   --timeout TIMEOUT, -T TIMEOUT
                         I/O timeout in seconds
   --mirror, -m          Mirror mode
+  --skip-error, -e      Skip error
 </pre></div>
 </div>
 <ul>
@@ -857,6 +910,11 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <kbd><span class="option">--mirror</span>, <span class="option">-m</span></kbd></td>
 <td><p class="first last">Mirror mode. If a file or folder not exist in destination, will delete it. Overwrite files.</p>
 </td></tr>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--skip-error</span>, <span class="option">-e</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">Skip error. Quiet mode.</p>
+</td></tr>
 </tbody>
 </table>
 </dd>
@@ -865,7 +923,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </ul>
 <p>This is a few examples:</p>
 <p>This command perform a restore on the same machine of the backup:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
 Want to <span class="k">do</span> restore path /mnt/backup/host1/2018_08_08__10_58/etc? To <span class="k">continue</span> <span class="o">[</span>Y/N<span class="o">]</span>? y
 Want to <span class="k">do</span> restore path /mnt/backup/host1/2018_08_08__10_58/Users? To <span class="k">continue</span> <span class="o">[</span>Y/N<span class="o">]</span>? y
 SUCCESS: Command rsync -ahu -vP --log-file<span class="o">=</span>/mnt/backup/host1/2018_08_08__10_58/restore.log /mnt/backup/host1/2018_08_08__10_58/etc arthur@host1:/restore_2018_08_08__10_58
@@ -878,7 +936,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 Butterfly Backup will select it directly from the catalog via the backup-id.</p>
 </div>
 <p>Now, select the last available backup on catalog; run this:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb restore --catalog /mnt/backup --last --computer host1 --log
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb restore --catalog /mnt/backup --last --computer host1 --log
 Want to <span class="k">do</span> restore path /mnt/backup/host1/2018_08_08__10_58/etc? To <span class="k">continue</span> <span class="o">[</span>Y/N<span class="o">]</span>? y
 Want to <span class="k">do</span> restore path /mnt/backup/host1/2018_08_08__10_58/Users? To <span class="k">continue</span> <span class="o">[</span>Y/N<span class="o">]</span>? y
 SUCCESS: Command rsync -ahu -vP --log-file<span class="o">=</span>/mnt/backup/host1/2018_08_08__10_58/restore.log /mnt/backup/host1/2018_08_08__10_58/etc arthur@host1:/restore_2018_08_08__10_59
@@ -886,7 +944,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </pre></div>
 </div>
 <p>This example, is the same as the previous one, but restore to other machine and other operating system:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host2 --type Unix --log --verbose
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host2 --type Unix --log --verbose
 INFO: Build a rsync <span class="nb">command</span>
 INFO: Command flags are: rsync -ahu -vP --log-file<span class="o">=</span>/mnt/backup/host1/2018_08_08__10_58/restore.log
 Want to <span class="k">do</span> restore path /mnt/backup/host1/2018_08_08__10_58/etc? To <span class="k">continue</span> <span class="o">[</span>Y/N<span class="o">]</span>? y
@@ -911,7 +969,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <div class="section" id="archive">
 <span id="id7"></span><h2>Archive<a class="headerlink" href="#archive" title="Permalink to this headline">¶</a></h2>
 <p>Archive operations are used to store backups by saving disk space. Backups older than n days are compressed into a zip file.</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb archive --help
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb archive --help
 usage: bb archive <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span> <span class="o">[</span>--log<span class="o">]</span> <span class="o">[</span>--dry-run<span class="o">]</span> --catalog CATALOG
                   <span class="o">[</span>--days DAYS<span class="o">]</span> --destination DESTINATION
 
@@ -944,9 +1002,10 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 <kbd><span class="option">--days</span>, <span class="option">-D</span></kbd></td>
 <td><p class="first last">Number of days for which you want to keep your backups. Default is 30.</p>
 </td></tr>
-<tr><td class="option-group">
-<kbd><span class="option">--destination</span></kbd></td>
-<td><p class="first last">New destination for compress zipped backup.</p>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--destination</span>, <span class="option">-d</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">New destination for compress zipped backup.</p>
 </td></tr>
 </tbody>
 </table>
@@ -955,21 +1014,21 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </li>
 </ul>
 <p>Archive old backup of 3 days:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb archive --catalog /mnt/backup/ --days <span class="m">3</span> --destination /mnt/archive/ --verbose --log
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb archive --catalog /mnt/backup/ --days <span class="m">3</span> --destination /mnt/archive/ --verbose --log
 INFO: Check archive this backup f65e5afe-9734-11e8-b0bb-005056a664e0. Folder /mnt/backup/host2/2018_08_08__17_50
 INFO: Check archive this backup 4f2b5f6e-9939-11e8-9ab6-005056a664e0. Folder /mnt/backup/host2/2018_08_04__07_26
 SUCCESS: Delete /mnt/backup/host2/2018_08_04__07_26 successfully.
 SUCCESS: Archive /mnt/backup/host2/2018_08_04__07_26 successfully.
-arthur@goldenheart$ ls /mnt/archive
+arthur@heartofgold$ ls /mnt/archive
 host1
-arthur@goldenheart$ ls /mnt/archive/host1
+arthur@heartofgold$ ls /mnt/archive/host1
 2018_08_06__07_26.zip
 </pre></div>
 </div>
 <p>The backup-id <em>f65e5afe-9734-11e8-b0bb-005056a664e0</em> it is not considered, because it falls within the established time.
 The other, however, is zipped and deleted.</p>
 <p>Lastly, let’s look in the catalog and see that the backup was actually archived:</p>
-<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@goldenheart$ bb list --catalog /mnt/backup/ -i 4f2b5f6e-9939-11e8-9ab6-005056a664e0
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb list --catalog /mnt/backup/ -i 4f2b5f6e-9939-11e8-9ab6-005056a664e0
 Backup id: 4f2b5f6e-9939-11e8-9ab6-005056a664e0
 Hostname or ip: host2
 Type: Incremental
@@ -983,6 +1042,111 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 </pre></div>
 </div>
 </div>
+<div class="section" id="export">
+<span id="id8"></span><h2>Export<a class="headerlink" href="#export" title="Permalink to this headline">¶</a></h2>
+<p>The export function is used to copy a particular backup to another path.</p>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb <span class="nb">export</span> -h
+usage: bb <span class="nb">export</span> <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span> <span class="o">[</span>--log<span class="o">]</span> <span class="o">[</span>--dry-run<span class="o">]</span> --catalog CATALOG
+                 --backup-id ID --destination DESTINATION <span class="o">[</span>--mirror<span class="o">]</span> <span class="o">[</span>--cut<span class="o">]</span>
+                 <span class="o">[</span>--include INCLUDE <span class="o">[</span>INCLUDE ...<span class="o">]]</span>
+                 <span class="o">[</span>--exclude EXCLUDE <span class="o">[</span>EXCLUDE ...<span class="o">]]</span> <span class="o">[</span>--timeout TIMEOUT<span class="o">]</span>
+                 <span class="o">[</span>--skip-error<span class="o">]</span>
+
+optional arguments:
+  -h, --help            show this <span class="nb">help</span> message and <span class="nb">exit</span>
+  --verbose, -v         Enable verbosity
+  --log, -l             Create a log
+  --dry-run, -N         Dry run mode
+
+Export options:
+  --catalog CATALOG, -C CATALOG
+                        Folder where is catalog file
+  --backup-id ID, -i ID
+                        Backup-id of backup
+  --destination DESTINATION, -d DESTINATION
+                        Destination path
+  --mirror, -m          Mirror mode
+  --cut, -c             Cut mode. Delete <span class="nb">source</span>
+  --include INCLUDE <span class="o">[</span>INCLUDE ...<span class="o">]</span>, -I INCLUDE <span class="o">[</span>INCLUDE ...<span class="o">]</span>
+                        Include pattern
+  --exclude EXCLUDE <span class="o">[</span>EXCLUDE ...<span class="o">]</span>, -E EXCLUDE <span class="o">[</span>EXCLUDE ...<span class="o">]</span>
+                        Exclude pattern
+  --timeout TIMEOUT, -T TIMEOUT
+                        I/O timeout in seconds
+  --skip-error, -e      Skip error
+</pre></div>
+</div>
+<ul>
+<li><dl class="first docutils">
+<dt><strong>Export options</strong></dt>
+<dd><table class="first last docutils option-list" frame="void" rules="none">
+<col class="option" />
+<col class="description" />
+<tbody valign="top">
+<tr><td class="option-group">
+<kbd><span class="option">--catalog</span>, <span class="option">-C</span></kbd></td>
+<td><p class="first last">Select the backups folder (root).</p>
+</td></tr>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--backup-id</span>, <span class="option">-i</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">Select backup id in the catalog.</p>
+</td></tr>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--destination</span>, <span class="option">-d</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">Destination path than export a backup.</p>
+</td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--mirror</span>, <span class="option">-m</span></kbd></td>
+<td><p class="first last">Mirror mode.</p>
+</td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--cut</span>, <span class="option">-c</span></kbd></td>
+<td><p class="first last">Cut mode. Delete source. Like a move function.</p>
+</td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--include</span>, <span class="option">-I</span></kbd></td>
+<td><p class="first last">Include pattern. Accept wildcard character.</p>
+</td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--exclude</span>, <span class="option">-E</span></kbd></td>
+<td><p class="first last">Exclude pattern. Accept wildcard character.</p>
+</td></tr>
+<tr><td class="option-group">
+<kbd><span class="option">--timeout</span>, <span class="option">-T</span></kbd></td>
+<td><p class="first last">Specify number of seconds of I/O timeout.</p>
+</td></tr>
+<tr><td class="option-group" colspan="2">
+<kbd><span class="option">--skip-error</span>, <span class="option">-e</span></kbd></td>
+</tr>
+<tr><td>&#160;</td><td><p class="first last">Skip error. Quiet mode.</p>
+</td></tr>
+</tbody>
+</table>
+</dd>
+</dl>
+</li>
+</ul>
+<p>Export a backup in other directory:</p>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb <span class="nb">export</span> --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /mnt/backup/export --verbose
+INFO: Export backup with id f0f700e8-0435-11e9-9e78-005056a664e0
+INFO: Build a rsync <span class="nb">command</span>
+Start <span class="nb">export</span> host1
+INFO: rsync command: rsync -ah --no-links -vP /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+SUCCESS: Command rsync -ah --no-links -vP /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+</pre></div>
+</div>
+<p>Export a backup with exclude pdf files:</p>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>arthur@heartofgold$ bb <span class="nb">export</span> --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /backup/export --verbose --exclude *.pdf
+INFO: Export backup with id f0f700e8-0435-11e9-9e78-005056a664e0
+INFO: Build a rsync <span class="nb">command</span>
+Start <span class="nb">export</span> host1
+INFO: rsync command: rsync -ah --no-links -vP --exclude<span class="o">=</span>*.pdf /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+SUCCESS: Command rsync -ah --no-links -vP --exclude<span class="o">=</span>*.pdf /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+</pre></div>
+</div>
+</div>
 </div>
 
 
@@ -996,7 +1160,7 @@ <h3>Cygwin on Windows<a class="headerlink" href="#cygwin-on-windows" title="Perm
 
   <div role="contentinfo">
     <p>
-        &copy; Copyright 2018, Matteo Guadrini &lt;matteo.guadrini@hotmail.it&gt;.
+        &copy; Copyright 2018, Matteo Guadrini &lt;matteo.guadrini@hotmail.it&gt;
 
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new mode 100755
index b99c83a..44463f9
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+++ b/docs/build/html/search.html
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-    <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
+  <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
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   <div role="contentinfo">
     <p>
-        &copy; Copyright 2018, Matteo Guadrini &lt;matteo.guadrini@hotmail.it&gt;.
+        &copy; Copyright 2018, Matteo Guadrini &lt;matteo.guadrini@hotmail.it&gt;
 
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-      <script type="text/javascript" src="_static/doctools.js"></script>
-      <script type="text/javascript" src="_static/searchtools.js"></script>
+    
+    
+      <script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
+        <script type="text/javascript" src="_static/jquery.js"></script>
+        <script type="text/javascript" src="_static/underscore.js"></script>
+        <script type="text/javascript" src="_static/doctools.js"></script>
+        <script type="text/javascript" src="_static/searchtools.js"></script>
+    
 
   
 
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-  
-    <script type="text/javascript" src="_static/js/theme.js"></script>
-  
+  <script type="text/javascript" src="_static/js/theme.js"></script>
 
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diff --git a/docs/source/conf.py b/docs/source/conf.py
old mode 100644
new mode 100755
diff --git a/docs/source/index.rst b/docs/source/index.rst
old mode 100644
new mode 100755
index cac52aa..799efea
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -22,6 +22,7 @@ Indices and tables
 * :ref:`list`
 * :ref:`restore`
 * :ref:`archive`
+* :ref:`export`
 * :ref:`search`
 
 .. _requirements:
@@ -41,10 +42,11 @@ Install Butterfly Backup is very simple; run this:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ git clone https://github.com/MatteoGuadrini/Butterfly-Backup.git
-   arthur@goldenheart$ cd Butterfly-Backup
-   arthur@goldenheart$ sudo python3 setup.py
-   arthur@goldenheart$ bb --help
+   arthur@heartofgold$ git clone https://github.com/MatteoGuadrini/Butterfly-Backup.git
+   arthur@heartofgold$ cd Butterfly-Backup
+   arthur@heartofgold$ sudo python3 setup.py
+   arthur@heartofgold$ bb --help
+   arthur@heartofgold$ man bb
 
 The upgrade is also simple; type the same commands.
 
@@ -62,7 +64,7 @@ Backups are organized according to precise cataloguing; this is an example:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ tree destination/of/backup
+   arthur@heartofgold$ tree destination/of/backup
    .
    ├── destination
    │   ├── hostname or ip of the PC under backup
@@ -91,13 +93,13 @@ This is how the operating system sees the backups on the file system:
 .. important::
    Be careful to not delete *.catalog.cfg* file.
 
-Backup butterfly has, in its core, five main operations:
+Butterfly Backup has, in its core, six main operations:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb --help
+   arthur@heartofgold$ bb --help
    usage: bb [-h] [--verbose] [--log] [--dry-run] [--version]
-             {config,backup,restore,archive,list} ...
+             {config,backup,restore,archive,list,export} ...
 
    Butterfly Backup
 
@@ -111,13 +113,14 @@ Backup butterfly has, in its core, five main operations:
    action:
      Valid action
 
-     {config,backup,restore,archive,list}
+     {config,backup,restore,archive,list,export}
                            Available actions
        config              Configuration options
        backup              Backup options
        restore             Restore options
        archive             Archive options
        list                List options
+       export              Export options
 
 Valid action
 
@@ -126,6 +129,7 @@ Valid action
 * **restore**: transactions that call rsync for pushing files to a client.
 * **archive**: transaction that zip old backups and move them to a new destination.
 * **list**: query the catalog.
+* **export**: export a single backup to other path.
 
 It also has three flags that can be very useful, especially in case of error.
 
@@ -148,7 +152,7 @@ Let's see how to go about looking at the help:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --help
+   arthur@heartofgold$ bb config --help
    usage: bb config [-h] [--verbose] [--log] [--dry-run] [--new | --remove]
                     [--deploy DEPLOY_HOST] [--user DEPLOY_USER]
 
@@ -181,7 +185,7 @@ At this point, we create the configuration:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --new
+   arthur@heartofgold$ bb config --new
    WARNING: Private key ~/.ssh/id_rsa exists
    If you want to use the existing key, run "bb config --deploy name_of_machine", otherwise to remove it, run "bb config --remove"
 
@@ -189,10 +193,10 @@ In this case, the RSA key already exists. Now try delete and create a new keys:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --remove
+   arthur@heartofgold$ bb config --remove
    Are you sure to remove existing rsa keys? To continue [Y/N]? y
    SUCCESS: Removed configuration successfully!
-   arthur@goldenheart$ bb config --new
+   arthur@heartofgold$ bb config --new
    SUCCESS: New configuration successfully created!
 
 Once you have created the configuration, keys should be installed (copied) on the hosts you 
@@ -200,8 +204,7 @@ want to backup.
 
 .. code-block:: bash
 
-   "
-   arthur@goldenheart$ bb config --deploy host1
+   arthur@heartofgold$ bb config --deploy host1
    Copying configuration to host1; write the password:
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/arthur/.ssh/id_rsa.pub"
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
@@ -214,14 +217,13 @@ want to backup.
    and check to make sure that only the key(s) you wanted were added.
 
    SUCCESS: Configuration copied successfully on host1!
-   "
 
 This command will try to copy the configuration with the current user.
 If you want to use a different user (e.g.: root), run this:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb config --deploy host1 --user root
+   arthur@heartofgold$ bb config --deploy host1 --user root
    "Copying configuration to host1; write the password:"
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/arthur/.ssh/id_rsa.pub"
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
@@ -269,7 +271,7 @@ Download https://cygwin.com/ cygwin and follow this instructions to install the
 
    C:
    chdir C:\cygwin\bin
-   mkpasswd -l > C:\cygwin\etc\passwd
+   mkpasswd -cl > C:\cygwin\etc\passwd
    bash ssh-host-config -y
    cygrunsrv -S sshd
 
@@ -287,10 +289,10 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --help
+   arthur@heartofgold$ bb backup --help
    usage: bb backup [-h] [--verbose] [--log] [--dry-run]
                     (--computer HOSTNAME | --list LIST) --destination DESTINATION
-                    [--mode {Full,Incremental,Mirror}]
+                    [--mode {Full,Incremental,Differential,Mirror}]
                     (--data {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...] | --custom-data CUSTOMDATA [CUSTOMDATA ...])
                     [--user USER] --type {Unix,Windows,MacOS} [--compress]
                     [--retention RETENTION] [--parallel PARALLEL]
@@ -308,7 +310,7 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
      --list LIST, -L LIST  File list of computers or ip addresses to backup
      --destination DESTINATION, -d DESTINATION
                            Destination path
-     --mode {Full,Incremental,Mirror}, -m {Full,Incremental,Mirror}
+     --mode {Full,Incremental,Differential,Mirror}, -m {Full,Incremental,Differential,Mirror}
                            Backup mode
      --data {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...], -D {User,Config,Application,System,Log} [{User,Config,Application,System,Log} ...]
                            Data of which you want to backup
@@ -325,6 +327,8 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
                            Number of parallel jobs
      --timeout TIMEOUT, -T TIMEOUT
                            I/O timeout in seconds
+     --skip-error, -e      Skip error
+
 
 
 * **Backup options**
@@ -340,13 +344,19 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
                            host2
 
                            ...
-   --destination           Select the destination folder (root).
+   --destination, -d       Select the destination folder (root).
    --mode, -m              Select how rsync perform backup:
 
-    * Full: Complete (full) backup.
-    * Incremental: Incremental backup is based on the latest Full (the same files are linked with hard link).
+    * Full:
+         Complete (full) backup.
+    * Incremental:
+         Incremental backup is based on the latest backup (the same files are linked with hard link).
+         A Full backup is executed if this mode fails to find one.
+    * Differential:
+         Incremental backup is based on the latest Full backup (the same files are linked with hard link).
          A Full backup is executed if this mode fails to find one.
-    * Mirror: Complete mirror backup. If a file in the source no longer exists, BB deletes it from the destination.
+    * Mirror:
+         Complete mirror backup. If a file in the source no longer exists, BB deletes it from the destination.
    --data, -D              Select the type of data to put under backup:
        The values change depending on the type of operating system:
 
@@ -366,6 +376,23 @@ There are two backup modes: single and bulk. Let's see how to go about looking a
    --retention, -r         Number of days for which you want to keep your backups.
    --parallel, -p          Maximum number of concurrent rsync processes. By default is 5 jobs.
    --timeout, -T           Specify number of seconds of I/O timeout.
+   --skip-error, -e        Skip error. Quiet mode.
+
+Flowchart of the differences between Differential and Incremental backup::
+
+   +----------+   +----------+   +----------+
+   |          |   |          |   |          |
+   |   Full   | <-+   Inc.   | <-+   Inc.   |
+   |          |   |          |   |          |
+   +----------+   +----------+   +----------+
+
+   +----------+   +----------+   +----------+
+   |          |   |          |   |          |
+   |   Full   | <-+   Dif.   |   |   Dif.   |
+   |          |   |          |   |          |
+   +----+-----+   +----------+   +----+-----+
+        ^                             |
+        +-----------------------------+
 
 
 .. _backup_computer:
@@ -380,7 +407,7 @@ This is a few examples:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
+   arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS
    # host1 SSH-2.0-OpenSSH_7.5
    # host1 SSH-2.0-OpenSSH_7.5
    Start backup on host1
@@ -392,14 +419,14 @@ This is a few examples:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --mode Full --data User Config --type MacOS --user root
+   arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --mode Full --data User Config --type MacOS --user root
    "root@host1's password:"
    Start backup on host1
    SUCCESS: Command rsync -ah --no-links root@host1:/Users :/private/etc /mnt/backup/host1/2018_08_08__10_30
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS --verbose --log
+   arthur@heartofgold$ bb backup --computer host1 --destination /mnt/backup --data User Config --type MacOS --verbose --log
    INFO: Build a rsync command
    INFO: Last full is 2018-08-08 10:30:32
    INFO: Command flags are: rsync -ahu --no-links --link-dest=/mnt/backup/host1/2018_08_08__10_28 -vP
@@ -433,7 +460,7 @@ This is a few examples:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS
+   arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS
    # host1 SSH-2.0-OpenSSH_7.5
    # host1 SSH-2.0-OpenSSH_7.5
    ERROR: The port 22 on host2 is closed!
@@ -452,7 +479,7 @@ This means that maximum two backup jobs will run at the same time. When a first
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --log
+   arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --log
    # host1 SSH-2.0-OpenSSH_7.5
    # host1 SSH-2.0-OpenSSH_7.5
    ERROR: The port 22 on host2 is closed!
@@ -464,7 +491,7 @@ This is the same example but specifying a retention at 3 (days). This means that
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --retention 3 --log --verbose
+   arthur@heartofgold$ bb backup --list /home/arthur/pclist.txt --destination /mnt/backup --data User Config --type MacOS --parallel 2 --retention 3 --log --verbose
    INFO: Build a rsync command
    INFO: Last full is 2018-08-08 10:30:32
    INFO: Command flags are: rsync -ahu --no-links --link-dest=/mnt/backup/host1/2018_08_08__10_30 -vP
@@ -504,9 +531,10 @@ To query this catalog, the list command exists.
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --help
+   arthur@heartofgold$ bb list --help
    usage: bb list [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
-                  [--backup-id ID] [--archived] [--cleaned]
+                  [--backup-id ID | --archived | --cleaned | --computer HOSTNAME]
+                  [--oneline]
 
    optional arguments:
      -h, --help            show this help message and exit
@@ -521,18 +549,24 @@ To query this catalog, the list command exists.
                            Backup-id of backup
      --archived, -a        List only archived backup
      --cleaned, -c         List only cleaned backup
+     --computer HOSTNAME, -H HOSTNAME
+                           List only match hostname or ip
+     --oneline, -o         One line output
+
 
 * **List options**
    --catalog, -C           Select the backups folder (root).
    --backup-id, -i         Select backup id in the catalog.
    --archived, -a          List only archived backups.
    --cleaned, -c           List only cleaned backups.
+   --computer, -H          List only match hostname or ip.
+   --oneline, -o           One line and concise output.
 
 First, let's query the catalog:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup
+   arthur@heartofgold$ bb list --catalog /mnt/backup
 
    BUTTERFLY BACKUP CATALOG
 
@@ -552,7 +586,7 @@ Press ``q`` for exit. Then we select a backup-id:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
+   arthur@heartofgold$ bb list --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0
    Backup id: dd6de2f2-9a1e-11e8-82b0-005056a664e0
    Hostname or ip: host1
    Type: Incremental
@@ -570,8 +604,8 @@ If you want to export the catalog list instead, include the log flag:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup --log
-   arthur@goldenheart$ cat /mnt/backup/backup.list
+   arthur@heartofgold$ bb list --catalog /mnt/backup --log
+   arthur@heartofgold$ cat /mnt/backup/backup.list
 
 Now that we have identified a backup, let's proceed with the restore
 
@@ -585,7 +619,7 @@ The restore process is the exact opposite of the backup process. It takes the fi
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --help
+   arthur@heartofgold$ bb restore --help
    usage: bb restore [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
                      (--backup-id ID | --last) [--user USER] --computer HOSTNAME
                      [--type {Unix,Windows,MacOS}] [--timeout TIMEOUT] [--mirror]
@@ -611,6 +645,7 @@ The restore process is the exact opposite of the backup process. It takes the fi
      --timeout TIMEOUT, -T TIMEOUT
                            I/O timeout in seconds
      --mirror, -m          Mirror mode
+     --skip-error, -e      Skip error
 
 * **Restore options**
    --catalog, -C           Select the backups folder (root).
@@ -626,6 +661,8 @@ The restore process is the exact opposite of the backup process. It takes the fi
 
    --timeout, -T           Specify number of seconds of I/O timeout.
    --mirror, -m            Mirror mode. If a file or folder not exist in destination, will delete it. Overwrite files.
+   --skip-error, -e        Skip error. Quiet mode.
+
 
 This is a few examples:
 
@@ -633,7 +670,7 @@ This command perform a restore on the same machine of the backup:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
+   arthur@heartofgold$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host1 --log
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/etc? To continue [Y/N]? y
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/Users? To continue [Y/N]? y
    SUCCESS: Command rsync -ahu -vP --log-file=/mnt/backup/host1/2018_08_08__10_58/restore.log /mnt/backup/host1/2018_08_08__10_58/etc arthur@host1:/restore_2018_08_08__10_58
@@ -647,7 +684,7 @@ Now, select the last available backup on catalog; run this:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --catalog /mnt/backup --last --computer host1 --log
+   arthur@heartofgold$ bb restore --catalog /mnt/backup --last --computer host1 --log
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/etc? To continue [Y/N]? y
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/Users? To continue [Y/N]? y
    SUCCESS: Command rsync -ahu -vP --log-file=/mnt/backup/host1/2018_08_08__10_58/restore.log /mnt/backup/host1/2018_08_08__10_58/etc arthur@host1:/restore_2018_08_08__10_59
@@ -657,7 +694,7 @@ This example, is the same as the previous one, but restore to other machine and
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host2 --type Unix --log --verbose
+   arthur@heartofgold$ bb restore --catalog /mnt/backup --backup-id dd6de2f2-9a1e-11e8-82b0-005056a664e0 --computer host2 --type Unix --log --verbose
    INFO: Build a rsync command
    INFO: Command flags are: rsync -ahu -vP --log-file=/mnt/backup/host1/2018_08_08__10_58/restore.log
    Want to do restore path /mnt/backup/host1/2018_08_08__10_58/etc? To continue [Y/N]? y
@@ -687,7 +724,7 @@ Archive operations are used to store backups by saving disk space. Backups older
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb archive --help
+   arthur@heartofgold$ bb archive --help
    usage: bb archive [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
                      [--days DAYS] --destination DESTINATION
 
@@ -708,20 +745,20 @@ Archive operations are used to store backups by saving disk space. Backups older
 * **Archive options**
    --catalog, -C           Select the backups folder (root).
    --days, -D              Number of days for which you want to keep your backups. Default is 30.
-   --destination           New destination for compress zipped backup.
+   --destination, -d       New destination for compress zipped backup.
 
 Archive old backup of 3 days:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb archive --catalog /mnt/backup/ --days 3 --destination /mnt/archive/ --verbose --log
+   arthur@heartofgold$ bb archive --catalog /mnt/backup/ --days 3 --destination /mnt/archive/ --verbose --log
    INFO: Check archive this backup f65e5afe-9734-11e8-b0bb-005056a664e0. Folder /mnt/backup/host2/2018_08_08__17_50
    INFO: Check archive this backup 4f2b5f6e-9939-11e8-9ab6-005056a664e0. Folder /mnt/backup/host2/2018_08_04__07_26
    SUCCESS: Delete /mnt/backup/host2/2018_08_04__07_26 successfully.
    SUCCESS: Archive /mnt/backup/host2/2018_08_04__07_26 successfully.
-   arthur@goldenheart$ ls /mnt/archive
+   arthur@heartofgold$ ls /mnt/archive
    host1
-   arthur@goldenheart$ ls /mnt/archive/host1
+   arthur@heartofgold$ ls /mnt/archive/host1
    2018_08_06__07_26.zip
 
 The backup-id *f65e5afe-9734-11e8-b0bb-005056a664e0* it is not considered, because it falls within the established time.
@@ -731,7 +768,7 @@ Lastly, let's look in the catalog and see that the backup was actually archived:
 
 .. code-block:: bash
 
-   arthur@goldenheart$ bb list --catalog /mnt/backup/ -i 4f2b5f6e-9939-11e8-9ab6-005056a664e0
+   arthur@heartofgold$ bb list --catalog /mnt/backup/ -i 4f2b5f6e-9939-11e8-9ab6-005056a664e0
    Backup id: 4f2b5f6e-9939-11e8-9ab6-005056a664e0
    Hostname or ip: host2
    Type: Incremental
@@ -742,3 +779,76 @@ Lastly, let's look in the catalog and see that the backup was actually archived:
    ExitCode: 0
    Path: /mnt/backup/host2/2018_08_04__07_26
    Archived: True
+
+.. _export:
+
+######
+Export
+######
+
+The export function is used to copy a particular backup to another path.
+
+.. code-block:: bash
+
+   arthur@heartofgold$ bb export -h
+   usage: bb export [-h] [--verbose] [--log] [--dry-run] --catalog CATALOG
+                    --backup-id ID --destination DESTINATION [--mirror] [--cut]
+                    [--include INCLUDE [INCLUDE ...]]
+                    [--exclude EXCLUDE [EXCLUDE ...]] [--timeout TIMEOUT]
+                    [--skip-error]
+
+   optional arguments:
+     -h, --help            show this help message and exit
+     --verbose, -v         Enable verbosity
+     --log, -l             Create a log
+     --dry-run, -N         Dry run mode
+
+   Export options:
+     --catalog CATALOG, -C CATALOG
+                           Folder where is catalog file
+     --backup-id ID, -i ID
+                           Backup-id of backup
+     --destination DESTINATION, -d DESTINATION
+                           Destination path
+     --mirror, -m          Mirror mode
+     --cut, -c             Cut mode. Delete source
+     --include INCLUDE [INCLUDE ...], -I INCLUDE [INCLUDE ...]
+                           Include pattern
+     --exclude EXCLUDE [EXCLUDE ...], -E EXCLUDE [EXCLUDE ...]
+                           Exclude pattern
+     --timeout TIMEOUT, -T TIMEOUT
+                           I/O timeout in seconds
+     --skip-error, -e      Skip error
+
+* **Export options**
+   --catalog, -C           Select the backups folder (root).
+   --backup-id, -i         Select backup id in the catalog.
+   --destination, -d       Destination path than export a backup.
+   --mirror, -m            Mirror mode.
+   --cut, -c               Cut mode. Delete source. Like a move function.
+   --include, -I           Include pattern. Accept wildcard character.
+   --exclude, -E           Exclude pattern. Accept wildcard character.
+   --timeout, -T           Specify number of seconds of I/O timeout.
+   --skip-error, -e        Skip error. Quiet mode.
+
+Export a backup in other directory:
+
+.. code-block:: bash
+
+   arthur@heartofgold$ bb export --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /mnt/backup/export --verbose
+   INFO: Export backup with id f0f700e8-0435-11e9-9e78-005056a664e0
+   INFO: Build a rsync command
+   Start export host1
+   INFO: rsync command: rsync -ah --no-links -vP /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+   SUCCESS: Command rsync -ah --no-links -vP /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+
+Export a backup with exclude pdf files:
+
+.. code-block:: bash
+
+   arthur@heartofgold$ bb export --catalog /mnt/backup/ --backup-id f0f700e8-0435-11e9-9e78-005056a664e0 --destination /backup/export --verbose --exclude *.pdf
+   INFO: Export backup with id f0f700e8-0435-11e9-9e78-005056a664e0
+   INFO: Build a rsync command
+   Start export host1
+   INFO: rsync command: rsync -ah --no-links -vP --exclude=*.pdf /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
+   SUCCESS: Command rsync -ah --no-links -vP --exclude=*.pdf /mnt/backup/host1/2018_12_20__10_02 /mnt/backup/export/host1
diff --git a/img/bb.png b/img/bb.png
old mode 100644
new mode 100755
diff --git a/setup.py b/setup.py
old mode 100644
new mode 100755
index fec7b62..f541306
--- a/setup.py
+++ b/setup.py
@@ -24,6 +24,8 @@
 import shutil
 import os
 import platform
+manpath = '/usr/share/man/man1'
+manpage = 'bb.man'
 
 if platform.system() == 'Darwin':
     # Mac OS installation
@@ -41,8 +43,13 @@
 if not os.path.exists(bb_path):
     os.mkdir(bb_path)
 
+# install Butterfly Backup
 shutil.copyfile(bb_core, os.path.join(bb_path, bb_core))
 shutil.copyfile(bb_utility, os.path.join(bb_path, bb_utility))
 os.chmod(os.path.join(bb_path, bb_core), mode=0o755)
 if not os.path.exists(bb_command):
     os.symlink(os.path.join(bb_path, bb_core), bb_command)
+
+# install man page
+shutil.copyfile(manpage, os.path.join(manpath, 'bb.1'))
+os.system('gzip -f {0}/bb.1'.format(manpath))
diff --git a/utility.py b/utility.py
old mode 100644
new mode 100755
index 89d50dc..25c87a0
--- a/utility.py
+++ b/utility.py
@@ -180,6 +180,8 @@ def make_symlink(source, destination):
     """
     import os
     try:
+        if os.path.exists(destination):
+            os.unlink(destination)
         os.symlink(source, destination)
     except OSError:
         print(PrintColor.YELLOW + "WARNING: MS-DOS file system doesn't support symlink file." + PrintColor.END)