I added JungleDisk (my current favorite) to the brief synopsis of backup software. I highly recommend JungleDisk, especially for Linux users. Another excellent Linux backup solution is Rsync.net. They support numerous Linux (as well as other) solutions and have some of the best customer support I have encountered. Unfortunately for by 400 GB backup sets the price becomes a little high.
For those in a Windows environment take a look at DataDepositBox. There software is a breeze to use and managing multiple accounts painless. The cost per storage is higher than JungleDisk but DataDepositBox’s other features may win you over.
See Online backup solutions for the short review.