btrfs-sync
Smart and easy sync of BTRFS snapshots, locally or through SSH.
Can be used in conjunction with btrfs-snp
# btrfs-sync --verbose --delete /home/user/.snapshots user@server:/media/USBdrive/home-snapshots
* Skip existing '/home/user/.snapshots/monthly_2018-01-09_200102'
* Skip existing '/home/user/.snapshots/monthly_2018-02-08_200102'
* Skip existing '/home/user/.snapshots/weekly_2018-02-09_140102'
* Skip existing '/home/user/.snapshots/weekly_2018-02-16_150102'
* Skip existing '/home/user/.snapshots/weekly_2018-02-23_150102'
* Skip existing '/home/user/.snapshots/weekly_2018-03-02_180102'
* Skip existing '/home/user/.snapshots/daily_2018-03-03_000101'
* Skip existing '/home/user/.snapshots/daily_2018-03-04_080101'
* Skip existing '/home/user/.snapshots/daily_2018-03-05_100102'
* Skip existing '/home/user/.snapshots/daily_2018-03-06_100102'
* Skip existing '/home/user/.snapshots/daily_2018-03-07_110102'
* Synchronizing '/home/user/.snapshots/hourly_2018-03-08_090101' using seed '.snapshots/hourly_2018-03-07_090101'...
time elapsed [0:00:24] | rate [11.1MiB/s] | total size [ 132MiB]
* Synchronizing '/home/user/.snapshots/hourly_2018-03-08_100101' using seed '.snapshots/hourly_2018-03-09_090101'...
time elapsed [0:01:05] | rate [11.1MiB/s] | total size [ 275MiB]
* Deleting non existent snapshots...
Delete subvolume (no-commit): '/media/USBdrive/home-snapshots/hourly_2018-03-08_090101'
Delete subvolume (no-commit): '/media/USBdrive/home-snapshots/hourly_2018-03-08_100101'
Features
- Simple syntax
- Progress indication
- Support for xz or pbzip2 compression in order to save bandwidth.
- Retention policy
- Automatic incremental synchronization
- Cron friendly
Usage
The syntax is similar to that of scp
Usage:
btrfs-sync [options] <src> [<src>...] [[user@]host:]<dir>
-k|--keep NUM keep only last <NUM> sync'ed snapshots
-d|--delete delete snapshots in <dst> that don't exist in <src>
-z|--xz use xz compression. Saves bandwidth, but uses one CPU
-Z|--pbzip2 use pbzip2 compression. Saves bandwidth, but uses all CPUs
-q|--quiet don't display progress
-v|--verbose display more information
-h|--help show usage
<src> can either be a single snapshot, or a folder containing snapshots
<user> requires privileged permissions at <host> for the 'btrfs' command
Examples
Manual
Synchronize snapshots of home to a USB drive
# btrfs-sync /home/user/.snapshots /media/USBdrive/home-snapshots
Synchronize snapshots of home to a USB drive in another machine
# btrfs-sync /home/user/.snapshots user@server:/media/USBdrive/home-snapshots
Synchronize one snapshot of home to a USB drive in another machine
# btrfs-sync /home/user/.snapshots/monthly_2018-02-08_200102 user@server:/media/USBdrive/home-snapshots
Synchronize only monthly snapshots of home to a USB drive in another machine
# btrfs-sync /home/user/.snapshots/monthly_* user@server:/media/USBdrive/home-snapshots
Cron
Daily synchronization over the internet, keep only last 50
cat > /etc/cron.daily/btrfs-sync <<EOF
#!/bin/bash
/usr/local/sbin/btrfs-sync --quiet --keep 50 --xz /home user@host:/path/to/snaps
EOF
chmod +x /etc/cron.daily/btrfs-sync
Daily synchronization in LAN, mirror snapshot directory
cat > /etc/cron.daily/btrfs-sync <<EOF
#!/bin/bash
/usr/local/sbin/btrfs-sync --quiet --delete /home user@host:/path/to/snaps
EOF
chmod +x /etc/cron.daily/btrfs-sync
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