I got this question:
Successfully started client service. Installation complete.
-dattobd not supported on this system
+Detected btrfs filesystem
+Detected LVM volumes
Please select the snapshot mechanism to be used for backups:
2) LVM - Logical Volume Manager snapshots
3) btrfs filesystem snapshots
4) Use no snapshot mechanism
Now, I have my system installed on a LVM, whereas the data is on a btrfs disk.
Thus, I’d like to answer with 5 (2 and 3). To be honest, I did not try, but would it be possible to let urbackup select LVM on the system drive and btrfs on the data disk?
In fact, I think that it is fairly unlikely that btrfs is used on a LVM, so that probably a selection is generally not needed (i.e. use btrfs on the btrfs filesystem and LVM on the LVM filesystem)