Originally posted by Risto:System wide backup is possible I think, but then to the other extreme. Complete system image, which includes the OS itself.
Havent looked at it for a long time, but when flashing using unofficial ways there is a chance to backup.
The in phone back up just saves a list of your apps and system settings does it not? Saved app data or save game data etc cannot be backed up. Or your home screen layout as mentioned above. Pain in the arse.