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I agree. If it’s unfixable it has to be something out of their control. I mean nothing is unfixable but really the only explanation for a bug being too costly to fix is that something auxiliary changed which forces you to either go back to the drawing board or cut your losses.
rsync from ZFS to an off-site unraid every 24 hours 5 times a week. on the sixth day it does a checksum based rsync which obviously means more stress so only do it once a week. the seventh day is reserved for ZFS scrubbing every two weeks.