Yes,
but you can not restore root and Kernel in / without Btrfs snapshot after any accidental change or bad upgrade of system, e.g. lost WIFI that pacman cannot run without internet.
Arch is the rolling release and could probably break.
My recommendation is setup:
- Root system and some important parts of Home should be in BTRFS filesystem
- Other parts of Home are “Downloads/ISO”, “Steam games” and “VM images” and “Multi media” in EXT4 or XFS partitions and mount to Home in Btrfs partition.
- daily BTRFS backup in other hard disk (Created backup is pretty quickly less than 10 seconds because of the deduplication ability ).
- If you have a lot of free space on the disk, you can convert the BTRFS profile of data “Single” to “DUP” (Two same your data in the same filesystem). The “self-healing” ability would be activated when using mirrored data.