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I think the more important question is "what kind of reception will I get from the FreeNAS forums if I turn up trying to run it on this ARM SBC with 4GB of non-ECC RAM?".

If you've ever lurked there, you'll probably know the answer already.

Absolutely. Depending if 4GB RAM is sufficient for you (ZFS can get really memory hungry depending on configuration).

FreeNAS not so much, needs x86, this board is ARM...

Should have specified I was referring to xigmanas (former nas4free). The specs, specifically the RAM, might not be enough to make a it a good idea, though.

I might be wrong, but I don't see why one wouldn't be able to build freenas for arm (all the included software should be arm64-compatible), it's just that so far no one took the time to do so and share it.

Will you get a benefit from doing ZFS mirror on 2 drives? Raidz2 or RaidZ3 is much more preferable for ZFS.

there are benefits to running ZFS on even a single drive, so yes.