@clacke @cwebber Once upon a time I decided to use btrfs for / so I could make system snapshots (/home was still ext4). One day I hibernated the system and booted it up from scratch rather than de-hibernating due to some mistake. That corrupted the filesystem and I wasn't able to recover it. Granted, that was some two years ago and it may have become more robust by now, but I haven't felt like trying it again since then.