ZFS has checksums, so you get a message if some bits are off. Backups has to be verified regulary, there is no exception even with ZFS. For example once a week

ZFS has checksums, so you get a message if some bits are off. Backups has to be verified regulary, there is no exception even with ZFS. For example once a week I fire up a PostgreSQL instance on my remote backup server by cloning one of the snapshots and then I use pg_dump so I also have a "traditional" backup of the database. I do not spend time on verifying this dump though, as the ZFS snapshot already worked fine :-) But I sometimes use the dump to test new hardware or a new PostgreSQL version.