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You could just go with two 10TB drives for $169 each (shucked drive from Best Buy) and do Raid 1. Don't need to get more complex than that.

This is the lowest these drives have been, and they have a WD Red/White inside if you "shuck it" (pull the drive out of the external enclosure).

Very cool! I am lucky and I get education pricing. I might have to dig into this a little deeper.