btrfs-sync/README.md
2018-03-13 19:48:39 +01:00

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# btrfs-sync
Smart and easy sync of BTRFS snapshots, locally or through SSH.
![Example](resources/btrfs-sync.gif)
Can be used in conjunction with [btrfs-snp](https://ownyourbits.com/2017/12/27/schedule-btrfs-snapshots-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
```
More at [ownyourbits.com](https://ownyourbits.com)