You're going to need a 3rd party backup program that does a complete disk sector by sector backup and can see the hidden partition. I believe that Acronis True Image should work.
I have not used this program, but it may also be an option for you:
http://www.todo-backup.com/Note that you posted to a forum dedicated to Windows Live OneCare, and it won't do what you want as it is a file backup program, not a partition/disk backup solution.
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~