> ZFS uses atomic writes and barriers

This about settles the question for me. Assuming that the implication that btrfs performs otherwise holds true.

Barriers are also used in btrfs.

and from what i can tell clone operations are also handled atomically

though i kinda wonder what exactly is meant by atomic writes.

Thanks for clearing that up.

I might have to dig into it a bit more.

Yeah, it depends on the use case. For home directories and large risk items like financial stuff, testing that barrier writes are happening is a good thing. You don't want a storm to knock out a DC to learn that the hw/sw fs stack was lying to you at some level.