Have you ever wanted to back up to S3? How about Google Storage or Rack Space's storage solution? There is an amazing little piece of software that will let you create a drive. It really does a lot more than that. It also encrypts everything you put up there. It compresses it and it does de-duplication. Wait there is more, it also does copy-on-write snapshotting, is optimized for high performance and supports low bandwidth connections.
So what's it called? S3QL written and maintained by Nikolaus Rath.
Here is how they describe it:
S3QL effectively provides a hard disk of dynamic, infinite capacity that can be accessed from any computer with internet access running Linux, FreeBSD or OS-X.
So far our tests have proven that it works great. So if you are looking for an easy way to backup linux or freebsd systems onto a cloud solution check this out. They even provide a script to help you do parallel rsync backup for even faster performance.
If you are on Ubuntu check out this article on how to get it setup. If you aren't don't worry the documentation on the site is very complete. There is a great wiki and active community.