> I don't think scrubbing will keep him from losing data when one of those drives fails or gets corrupted.

It pains me to see a ZFS pool with no redundancy because instead of being "blissfully" ignorant of bit rot, you'll be alerted to its presence and then have to attempt to recover the files manually via the replica on the other NAS.

I appreciate that the author recognizes what his goals are, and that pool level redundancy is not one of them, but my goals are very different.