Fundamentally flawed. Users are prompted to create a plan to back up their home directory to MobileMe. Well...great...except that each plan is limited to 90 megs. Kind of silly, ey?
OK, so having done MobileMe support for a few months (until something better came along after I relocated to TX), I can tell you that many, many people have been burned by this Backup application, when used in conjunction with MobileMe.
Call MobileMe support (or chat them through the Apple Support forum) and ask a tech if it's possible to do a complete restore using Backup archives stored in MobileMe. Go ahead...
Free. Yes. Good. No. Get Carbon Copy Cloner or  SuperDuper...
Don Montalvo, TX