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Changing the location of BTRFS snapshots ? (lemmy.today)

submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]

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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 ?

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[–] [email protected] 2 points 1 month ago

You must take snapshots on the same btrfs filesystem. You can btrfs send snapshots 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.