Oh, after reading up on RAID mirrors more I saw that, using a disk that's part of a mirror as a backup just doesn't make sense. I love the concept of ZFS and will return to try it again down the road but it's not for me today. I spend some weeks trying to get it all to work and bailed and got the UFS/rsync setup running in a trivially small amount of time. There were a handful of little odds and ends like that. It got confused a couple of times and I had to clear the PULL replications and start over to keep it going.
I had clones that showed up in the GUI but could not be removed/destroyed. I couldn't get all of my snapshots covered under one recursion to replicate, it would do say 5 of 9 of them for some reason. I was able to make ZFS work quite well via the CLI (that was a lot of fun actually, what a great filesystem) but not through the GUI. One is my main data disk and I rsync to the others via overnight cron jobs. I ended up just making 3x 2TB UFS file systems. Anybody with more experience with ZFS able tocomment about ZFS supporting 3 drive mirrors? I'm really interested to know if you can do a 3 way mirror with ZFS now. You know, I wanted to dismiss your whole idea as "omg this guy is a moron", but aside from the fact that you don't have any data protection for the server typically since you have no mirrors/checksums/parity, I'd say it's definitely "workable". Of course, you might have that issue solved with snapshots. The only real drawback I see is that if someone deletes a file you don't have a bunch of historical backups to go back and find a file from 2 weeks ago that was deleted. I'm guessing that the GUI doesn't support it but the CLI does. Then you have 2 mirrors in the working system plus the backup mirror. So my recommendation would be to find out if a 3-way mirror is possible(I'm not sure if it is to be honest). You'd basically be deliberately be giving up the reliability that makes ZFS so great.
But ZFS really relies on parity/checksums/mirrors to correct errors such as bitrot. Well, you make a good case for your idea.
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