A simple script for backing up snapshots created by Snapper, for use in systemd environments. Useful if you want to use btrfs send-receive to back up your snapshots onto an external device.
The script assumes a particular setup: a file remote-id is placed into the .snapshots directory of the volume that is snapshotted to keep track of the snapshot that has last been backed up to the external disk. Also, the first line of the script is where the snapshots will be backed up to. You need to edit that line to point to where you actually want to store the backups.
Next, create a first time setup:
# If you don't yet have one (e.g. for snapshots of /home), assuming you name it "home"
# Note that you always have a config "root" that points to /
snapper -c home create-config /home
snapper -c home create -t single -p -d "External backup" > /home/.snapshots/remote-id
mkdir -p /mnt/archive/snapshots/home
btrfs send /home/.snapshots/$(cat /home/.snapshots/remote-id)/snapshot | btrfs receive /mnt/archive/snapshots/home
mv /mnt/archive/snapshots/home/snapshot /mnt/archive/snapshots/home/$(cat /home/.snapshots/remote-id)To run it once, simply call:
sudo snapper-backup.sh homeBut it really is meant to be run from the included systemd timer unit. First, put the snapper-backup.sh script into /usr/local/sbin/, and then the two units into /etc/systemd/system, and finally run:
# If you want to snapshot the "home" config:
sudo systemctl enable snapper-backup@home.timerYou can run as many timers as you want, one line for each config to snapshot.