It's funny that you link to a comment from 6 years ago. Just a month after that there was a pretty big bug in ZFS that corrupted data.

https://github.com/openzfs/zfs/issues/7401

Corresponding HN discussion at the time: https://news.ycombinator.com/item?id=16797644

Yes, I read that. It is underpinning the 3-2-1 rule, 3 backups, on 2 different mediums (where zfs can be one of the two), one off-site.

I think it makes sense and thank you for the sensible reminder.