I've been using DropBox.com for over a year and love it. It's FREE and is effectively a USB Thumb Drive in the cloud.
When creating Powerpoint presentations, moving PC programs around, or just making sure my checkbook Excel file is current, I move everything onto the Dropbox drive and it automatically sync's it between my devices (including my iPad!).
This is NOT a commercial, it is a tip! It is one of those cool things I discovered and want to share with the IBM i Midrange community. Follow the link in this post, and if you sign up you get a free 2GB dropbox drive and of course they have more space options if you want to pay for it.
I wrote this article in my RPG Report newsletter on backups, and mentioned Dropbox, and a lot of readers signed up for it. No I get no nothing if you sign up, I don't care about that, it's one of those things like Skype or gmail.com that people should know about.