Re: Raid help
Be careful with the USB drives. They aren't as robust as folks would have you believe. They're the new 3.5 floppy, and their reliability stinks if you don't treat them like Gold Pressed Latinum. But it's always good to have redundant sources to back up your data. In the future, you might look at building a NAS box out of spare PC parts. The OS itself doesn't require a lot of horsepower, and you can make backups to it.
FreeNAS is a good OS to do this with. I also (heartily) recommend Windows Home Server. I use it, and it's an absolute boon to my archiving process at home.