The redundancy of RAID is useless if your house burns down, etc. You're also dependent on how well the NAS reports disk problems, and how well it manages the drive swap when problems happen.


I'm a huge fan of Jungle Disk. $2/month service fee, then $0.15/GB storage pay-as-you-use, and I believe no bandwidth cost if you use Rackspace CF as the storage site. The software is simple yet effective - backups can be as often as 15 minutes, or as infrequent as when you click the button. It can also be a networked storage drive. It offers version control, so it can keep up to perhaps 10 revisions of a particular file (up to 60 days old). I haven't played much with that feature though.


I use it for personal files and key photographic files while "in progress". I keep a second set of storage drives at my parents' house as my off-site safety net.