snap-sync

About

This bash script sends incremental snapshots to another drive for backing up data. Plug in and mount any btrfs-formatted device you want your system to be backed up to (like a USB drive). When you run the script you will be prompted to select a mounted btrfs device.

The script iterates through all snapper configurations. For each configuration it creates a new local snapshot. If you have never synced to the specified device you will be prompted to enter a directory on the device where the backup snapshots will go. Additionally you are show the location of the backed up snapshot. If you have performed a backup to this device before, only the changes since the last backup have to be sent.

Requirements

snapper is required.

Example output

# snap-sync

Selected a mounted BTRFS device to backup to.
1) 43cedfb6-8775-43be-8abc-ee63bb92e10e (/)
2) 43cedfb6-8775-43be-8abc-ee63bb92e10e (/.snapshots)
3) 43cedfb6-8775-43be-8abc-ee63bb92e10e (/home)
4) 7360922b-c916-4d9f-a670-67fe0b91143c (/run/media/wes/backup)
0) Exit
Enter a number: 4
You selected the disk with UUID 7360922b-c916-4d9f-a670-67fe0b91143c.
At 'home' configuration
Backup location: /run/media/wes/backup/acer-c720/home/1097/
Continue (y/n)? y
At subvol /home/.snapshots/1097/snapshot
At 'root' configuration
Backup location: /run/media/wes/backup/acer-c720/root/2288/
Continue (y/n)? y
At subvol //.snapshots/2288/snapshot
Done!

The related snapshots from this on the local machine are for home:

single | 1097 |       | Sat 01 Oct 2016 07:48:40 AM CDT | root |          | latest incremental backup | backupdir=acer-c720, uuid=7360922b-c916-4d9f-a670-67fe0b91143c

and for root:

single | 2288 |       | Sat 01 Oct 2016 07:50:56 AM CDT | root |          | latest incremental backup | backupdir=acer-c720, uuid=7360922b-c916-4d9f-a670-67fe0b91143c

As you can see the userdata column for snapper is used to keep track of these snapshots for the next time the script is run so that only the changes will need to be sent.