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

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/linux4noobs

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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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[–] ikidd 3 points 1 month ago* (last edited 1 month ago) (1 children)

Since snapshots are just a feature of COW where it shifts the newly written or changed blocks to a different reference point on the partition, I can't see that you can create them on a different partition. I could be wrong.

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

Yeah, that's what I'm thinking too.