diff --git a/classes/local/backup/restore_lifecycle_workflow.php b/classes/local/backup/restore_lifecycle_workflow.php
index 4fdf1640..36fb71a1 100644
--- a/classes/local/backup/restore_lifecycle_workflow.php
+++ b/classes/local/backup/restore_lifecycle_workflow.php
@@ -25,6 +25,7 @@
 use tool_lifecycle\local\entity\step_subplugin;
 use tool_lifecycle\local\entity\trigger_subplugin;
 use tool_lifecycle\local\entity\workflow;
+use tool_lifecycle\local\manager\lib_manager;
 use tool_lifecycle\local\manager\workflow_manager;
 use tool_lifecycle\local\manager\step_manager;
 use tool_lifecycle\local\manager\trigger_manager;
@@ -76,6 +77,7 @@ public function execute() {
         // If the workflow could be loaded continue with the subplugins.
         if ($this->workflow) {
             $this->load_subplugins();
+            $this->check_subplugin_validity();
             // Validate the subplugin data.
             if (empty($this->errors) && $this->all_subplugins_installed()) {
                 // If all loaded data is valid, the new workflow and the steps can be stored in the database.
@@ -174,6 +176,38 @@ private function all_subplugins_installed() {
         return true;
     }
 
+    private function check_subplugin_validity() {
+        foreach ($this->steps as $step) {
+            $steplib = lib_manager::get_step_lib($step->subpluginname);
+            $filteredsettings = [];
+            foreach ($this->settings as $setting) {
+                if ($setting->pluginid === $step->id) {
+                    $filteredsettings[$setting->name] = $setting->value;
+                }
+            }
+            $errors = array_map(
+                    fn($x) => get_string('restore_error_in_step', 'tool_lifecycle', $step->instancename) . $x,
+                    $steplib->ensure_validity($filteredsettings)
+            );
+            $this->errors = array_merge($this->errors, $errors);
+        }
+
+        foreach ($this->trigger as $trigger) {
+            $steplib = lib_manager::get_trigger_lib($trigger->subpluginname);
+            $filteredsettings = [];
+            foreach ($this->settings as $setting) {
+                if ($setting->pluginid === $trigger->id) {
+                    $filteredsettings[$setting->name] = $setting->value;
+                }
+            }
+            $errors = array_map(
+                    fn($x) => get_string('restore_error_in_trigger', 'tool_lifecycle', $trigger->instancename) . $x,
+                    $steplib->ensure_validity($filteredsettings)
+            );
+            $this->errors = array_merge($this->errors, $errors);
+        }
+    }
+
     /**
      * Stores all loaded data in the database.
      * @throws \moodle_exception
diff --git a/lang/en/tool_lifecycle.php b/lang/en/tool_lifecycle.php
index c88413f3..533c4a4c 100644
--- a/lang/en/tool_lifecycle.php
+++ b/lang/en/tool_lifecycle.php
@@ -188,6 +188,8 @@
 $string['restore_subplugins_invalid'] = 'Wrong format of the backup file. The structure of the subplugin elements is not as expected.';
 $string['restore_step_does_not_exist'] = 'The step {$a} is not installed, but is included in the backup file. Please installed it first and try again.';
 $string['restore_trigger_does_not_exist'] = 'The trigger {$a} is not installed, but is included in the backup file. Please installed it first and try again.';
+$string['restore_error_in_step'] = 'An error occurred when importing step "{$a}": ';
+$string['restore_error_in_trigger'] = 'An error occurred when importing trigger "{$a}": ';
 
 // Events.
 $string['process_triggered_event'] = 'A process has been triggered';
diff --git a/step/lib.php b/step/lib.php
index 86c8345c..20754d9b 100644
--- a/step/lib.php
+++ b/step/lib.php
@@ -142,6 +142,16 @@ public function extend_add_instance_form_definition_after_data($mform, $settings
     public function abort_course($process) {
     }
 
+
+    /**
+     * Ensure validity of settings upon backup restoration.
+     * @param array $settings
+     * @return array List of errors with settings. If empty, the given settings are valid.
+     */
+    public function ensure_validity(array $settings) : array {
+        return [];
+    }
+
 }
 
 /**
diff --git a/trigger/categories/lang/de/lifecycletrigger_categories.php b/trigger/categories/lang/de/lifecycletrigger_categories.php
index fcec1378..926e9d88 100644
--- a/trigger/categories/lang/de/lifecycletrigger_categories.php
+++ b/trigger/categories/lang/de/lifecycletrigger_categories.php
@@ -28,3 +28,4 @@
 $string['categories'] = 'Kategorien, für die der Workflow ausgelöst werden soll.';
 $string['categories_noselection'] = 'Bitte wählen sie mindestens eine Kategorie aus.';
 $string['exclude'] = 'Falls ausgewählt, werden gerade die Kurse der angegebenen Kategorien nicht ausgelöst.';
+$string['category_does_not_exist'] = 'Es gibt keine Kurskategorie mit der ID {$a}.';
diff --git a/trigger/categories/lang/en/lifecycletrigger_categories.php b/trigger/categories/lang/en/lifecycletrigger_categories.php
index 423bd48e..7b1f9b3a 100644
--- a/trigger/categories/lang/en/lifecycletrigger_categories.php
+++ b/trigger/categories/lang/en/lifecycletrigger_categories.php
@@ -28,3 +28,4 @@
 $string['categories'] = 'Categories, for which the workflow should be triggered';
 $string['categories_noselection'] = 'Please choose at least one category.';
 $string['exclude'] = 'If ticked, the named categories are excluded from triggering instead.';
+$string['category_does_not_exist'] = 'There is no course category with id {$a}.';
diff --git a/trigger/categories/lib.php b/trigger/categories/lib.php
index 0ace8460..d2681f80 100644
--- a/trigger/categories/lib.php
+++ b/trigger/categories/lib.php
@@ -131,4 +131,17 @@ public function extend_add_instance_form_definition($mform) {
         $mform->setType('exclude', PARAM_BOOL);
     }
 
+    public function ensure_validity(array $settings): array {
+        $errors = [];
+        $categories = explode(',', $settings['categories']);
+        // Use core_course_category for moodle 3.6 and higher.
+        $categoryobjects = \core_course_category::get_many($categories);
+        foreach ($categories as $category) {
+            if(!$categoryobjects[$category]) {
+                $errors[] = get_string('category_does_not_exist', 'lifecycletrigger_categories', $category);
+            }
+        }
+        return $errors;
+    }
+
 }
diff --git a/trigger/lib.php b/trigger/lib.php
index 312c967c..c597c392 100644
--- a/trigger/lib.php
+++ b/trigger/lib.php
@@ -115,6 +115,15 @@ public function get_status_message() {
         return get_string("workflow_started", "tool_lifecycle");
     }
 
+    /**
+     * Ensure validity of settings upon backup restoration.
+     * @param array $settings
+     * @return array List of errors with settings. If empty, the given settings are valid.
+     */
+    public function ensure_validity(array $settings) : array {
+        return [];
+    }
+
 }
 
 /**