Was very close to losing a lot of personal data today despite having multiple geo-distributed backups, due to a fun quirk/bug around ZFS encryption: https://github.com/openzfs/zfs/issues/12614
Seems that ZFS dataset replication is not a great backup strategy after all. (Even just the fact that you can't easily export the wrapping keys)
Luckily I was able to bug a person on another continent for long enough to stick the original media into a PC and allow me to recover from that.
