I just did an iTunes backup of my phone and it took forever (about 20 minutes). I found the backup in the MobileSync directory and it's a colossal 33GB. Meanwhile, my iCloud backup of the same phone is only using 4.2GB. Does anyone know what could be accounting for the extra 29GB or so? I don't have anything excluded from my iCloud backup, and while I'd expect a difference of a few % between the sizes due to differing storage methods and such, a factor of seven is a bit too much to ignore.