ZFS is not a backup, but explicitly choosing to sacrifice the redundancy you have seems like the wrong move. By taking them out of mirroring you are guaranteed to only have what is in your backup in the case of failure, with no chance of recovery. IMO the correct answer is either to buy larger drives for backups or have less data (sacrilege).
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I would just buy a external drive, they're been coming down in price anyway
I think buying a larger drive would indeed be the safest option.
Can you backup directly to backblaze? Bypassing the 1TB drive?
That would indeed solve the problem. Although I'm a bit hesitant as I do like the peace of mind when having an additional copy. Otherwise I only have two real copies of my data.
I guess as the two drives are in a zfs mirror, restoring could still be done locally without pulling data from blackblaze. If I want to revert my data back to a previous state, I can't do it with a local copy, so I would have to pull quite some data from blackblaze.
If you can afford it, buying a cheap 10TB external drive might be the best solution. I'm hesitant to recommend taking down the ZFS array, it does help with data reliability.
Yeah exactly, I think I'll just upgrade the 1TB drive.