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Add doc about keep restriction on incremental backups #986

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Aug 19, 2024
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Add doc about keep restriction on incremental backups #986

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15 changes: 15 additions & 0 deletions doc/manual/43-backup-commands.en.md
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Expand Up @@ -76,6 +76,21 @@ the server then you can make it an archival backup with:
barman keep <server_name> <backup_id> [--target TARGET, --status, --release]
```

> **NOTE:**
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> To ensure the integrity of your backup system, incremental backups
> cannot use the keep annotation in Barman. This restriction is due to
> the way incremental backups depend on each other. Using the keep
> annotation with incremental backups could result in orphaned backups,
> which means that certain backups might exist without their necessary
> parent backups.
>
> In simpler terms, if you were allowed to apply the keep annotation to
> an incremental backup, there would be a risk that parts of the backup
> chain would be retained without their required predecessors. This
> situation could create backups that would be no longer useful or
> complete, as they would be missing the essential parent backups needed
> to restore them properly.

Possible values for `TARGET` are:

* `full`: The backup can always be used to recover to the latest point in
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