ericapomme / archive_snapshot.sh

A less convoluted approach to archiving btrfs snapshots.

archive_snapshot.sh

A less convoluted approach to archiving btrfs snapshots.

My attempt at this in Python (https://github.com/EricaPomme/archive_snapshot) worked out to be a bit less elegant than I'd have liked. This is a simpler version in bash.

Settings are done in variables at the top of the script:

• MIN_SNAPSHOTS: The minimum number of snapshots to keep. If we're past the disk usage threshold and you're at or below this number, no archiving will happen.
• SPACE_THRESHOLD: If disk usage on the destination is above this percentage, attempt to clear the oldest snapshots until we have enough room.
• SRC: Snapshot source
• DEST: Destination
• SNAPSHOT_SEARCH_REGEX: We use 'find' to get the paths for our snapshots to send. This regex should match your snapshots as directly as possible.

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I use this in a cron job to backup my VMs on my Unraid server.

# Daily snapshot of VM images at 2am
0 2 * * * btrfs subvolume snapshot -r /mnt/images/domains /mnt/images/.snapshots/`date +%Y%m%d` && bash /boot/custom/archive_snapshot.sh