I currently have some data on my MBA but the bulk and balance of it resides on a 1TB usb external drive. I'm long overdue to set up a backup, but don't really know a ton about it. The wireless feature of a 2TB Time Capsule is certainly appealing, but the cost really isn't. I get the concept of RAID backup, but don't know what software/hardware I would need to get started. Can anyone please offer some suggestions? Thanks in advance!