Can’t you also snapshot LVM volumes directly? So if you have an LVM volume, it shouldn’t matter what the filesystem is, provided it is sync’d… in theory.
(I’ve only done this on VMs that could be paused before the snapshot, so YMMV.)
Yeah, you can take live snapshots with LVM. You can use wyng-backup to incrementally take and back them up somewhere outside LVM. This has been working pretty well for me to backup libvirt domains backed by LVs
(I’ve only done this on VMs that could be paused before the snapshot, so YMMV.)