unRAID (Score 1)

It's still no replacement for offsite backups but Lime Technology (http://lime-technology.com/) has a JBOD+parity solution that uses a parity drive to protect your data but even in a 2 disk failure more you only lose the data from those disks (or if the second was the parity drive you just lose the data from the one disk). And in the case of a single drive failure it'll limp along using the parity drive until you replace the bad disk and rebuild. The 3-drive version is free but if you want to go bigger they charge a nominal cost (sub $100)

It works as a great solution for a media server where you may not necessarily care about all the data but you'd prefer to not lose ALL of it at once should multiple drives fail.