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Port the parent directory discovery logic from LVM to Btrfs (#80).

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Dan Helfman
2024-12-03 12:15:34 -08:00
parent 8c4b899a13
commit 9b9ecad299
2 changed files with 75 additions and 33 deletions
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docs/how-to/snapshot-your-filesystems.md
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@@ -138,6 +138,14 @@ subvolumes (non-recursively) and includes the snapshotted files in the paths
sent to Borg. borgmatic is also responsible for cleaning up (deleting) these
snapshots after a backup completes.
borgmatic is smart enough to look at the parent (and grandparent, etc.)
directories of each of your `source_directories` to discover any subvolumes.
For instance, let's say you add `/var/log` and `/var/lib` to your source
directories, but `/var` is a subvolume. borgmatic will discover that and
snapshot `/var` accordingly. This also works even with nested subvolumes;
borgmatic selects the subvolume that's the "closest" parent to your source
directories.
Additionally, borgmatic rewrites the snapshot file paths so that they appear
at their original subvolume locations in a Borg archive. For instance, if your
subvolume exists at `/var/subvolume`, then the snapshotted files will appear