Can I change the location of BTRFS snapshots. I installed CachyOS, and it automatically setup BTRFS subvols.
This is the layout 👇
| ID | gen | parent | top level | path |
|---|---|---|---|---|
| 258 | 1773 | 5 | 5 | @root |
| 259 | 1601 | 5 | 5 | @srv |
| 260 | 1789 | 5 | 5 | @cache |
| 261 | 1785 | 5 | 5 | @tmp |
| 262 | 1797 | 5 | 5 | @log |
| 263 | 26 | 377 | 377 | var/lib/portables |
| 264 | 26 | 377 | 377 | var/lib/machines |
| 265 | 1791 | 377 | 377 | .snapshots |
| 266 | 1427 | 378 | 378 | @home/.snapshots |
| 377 | 1797 | 5 | 5 | @ |
| 378 | 1797 | 5 | 5 | @home |
According to Arch wiki https://wiki.archlinux.org/title/Snapper#Creating_a_new_configuration
Create a subvolume at /path/to/subvolume/.snapshots where future snapshots for this configuration will be stored. A snapshot’s path is /path/to/subvolume/.snapshots/#/snapshot, where # is the snapshot number.
From which I understand that if I created a snap of /home (@home), it will save in /home/.snapshots (@home/.snapshots).
So, CachyOS configured to save snaps to separate subvol.
But, what I want to do is, Instead of just saving it in separate subvol, i want snaps to be saved on different btrfs partition. Maybe @home/.snapshots but on different partition.
Is that possible ?
You must take snapshots on the same btrfs filesystem. You can
btrfs sendsnapshots to another filesystem after the fact but they’ll no longer be deltas, they’ll include the full content that they reference. Setting up deltas across filesystems is complicated, do yourself a favor and use something like btrbk to simplify the process.