I would like to play with ceph but I don't have a lot of spare equipment anymore, and I understand ZFS pretty well, and trust it. Maybe the next cluster upgrade if I ever do another one.

And I have an almost unhealthy paranoia after see so many shitshows in my career, so having a pile of copies just helps me sleep at night. The day I have to delve into the last layer is the day I build another layer, but that hasn't happened recently. PBS dedup is pretty damn good so it's not much extra to keep a lot of copies.