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btrfs snapshot automation script
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| # systemd main unit file for btrfs incremental snapshotting | |
| [Unit] | |
| Description=Execute btrfs snapshot routine for given volumes | |
| [Service] | |
| Type=oneshot | |
| ExecStart=/usr/local/bin/btrfs_backup /home 60 # Choose partition mount point and num backups to keep here |
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| #!/bin/sh | |
| backup_name=$(date +%Y%m%d-%T) | |
| # Exit in error if given arg is not a subvolume | |
| sudo btrfs subvolume show $1 1>/dev/null || exit 1 | |
| if [ ! -d $1/.snapshots ] | |
| then | |
| echo Missing intermidiate dir | |
| sudo mkdir $1/.snapshots | |
| fi | |
| # Run the backup | |
| btrfs subvolume snapshot -r $1 $1/.snapshots/$backup_name | |
| # Delete all but the newest n backups in the snapshots directory | |
| for snapshot in $(ls -1t $1/.snapshots | head -n -$2) | |
| do | |
| btrfs subvolume delete $1/.snapshots/$snapshot | |
| done |
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| # systemd timer unit file for btrfs incremental snapshotting | |
| [Unit] | |
| Description=Run btrfs snapshot on selected drives every 5 mins | |
| [Timer] | |
| OnBootSec=5min | |
| OnUnitActiveSec=5min # modify these to change snapshot frequency | |
| RandomizedDelaySec=10 | |
| [Install] | |
| WantedBy=timers.target |
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| # crontab entry for every 5th minutes | |
| */5 * * * * /usr/local/bin/btrfs_backup /home 60 |
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| #!/bin/bash | |
| # Use crontab or systemd | |
| USE_CRONTAB=false | |
| # Copy into place | |
| sudo cp btrfs_backup.sh /usr/local/bin/btrfs_backup | |
| if [[ "$USE_CRONTAB" ]] | |
| then | |
| echo Installing using crontab | |
| crontab crontab-entry-5th-min | |
| else | |
| echo Installing using systemd | |
| sudo cp btrfs_backup.service /etc/systemd/system/ | |
| sudo cp btrfs_backup.timer /etc/systemd/system/ | |
| sudo systemctl enable btrfs_backup.service | |
| sudo systemctl start btrfs_backup.service | |
| fi |
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