Anyone using Carbonite should be very careful to check that it is backing up the files they think it is. When I tested it out last year I discovered that it had arbitrary rules about the type, size and location of files that it would backup. For example it wouldn't backup any exe files wherever they are or certain video files if they weren't in the My Documents folders or any file above a certain size that weren't in the My Documents folder.

None of these rules were visible or changeable via the UI, I had to write a bit of code to parse an registry entry that contained the rules to work out why it was refusing to backup certain files.

This may have changed by now, but it is something to be aware off. Thankfully Mozy just backs up what you ask it to.