And doing RAID on the backup server would not only mean paying more than double for what the actual server HDDs would cost to have at least the same amount of storage, but also paying a lot more for power if the drives run 24/7, which probably comes out to around the same 500 bucks that a large enough HDD would cost (like those 28TB Seagate server drives).
Maybe 14TB is enough for an upgrade for now... :floofWoozy: