Use case: we have about 30TB of data we pretty quickly need to get onto some kind of cold storage media lest our hard drives cough up a hairball, and so we can, preferably, migrate from btrfs to zfs. Seems like we can get LTO7/8 tapes pretty easily, what would be the easiest way to get a drive that can connect to a Dell R420, presumably drop in a SAS HBA and connect a drive that way? And, price, for a used one?