If you care about your data use ZFS, 3 18TB drives Raid Z1 should do, any random computer with 3 drive bays You can set up zpool scrub every week and email you

If you care about your data use ZFS, 3 18TB drives Raid Z1 should do, any random computer with 3 drive bays You can set up zpool scrub every week and email yourself the results to check the files are surviving