I have an iPhone 4 now. I'm going to be getting an iPhone 5 Dec. 29. I want to sell my 4 to offset the cost of the new phone. I know I can obviously plug my phone into my MacBook Air and back it up through iTunes (or back it up using iCloud). I am just wondering if this literally backs up EVERYTHING (photos, videos, music), or just contacts, preferences, things like that? I'm 99.5% sure it backs up everything, but I want to be positive. I am going to have a week or two where I'm going to have to use an old Droid (just got a nice offer on my current iPhone and I want to get the cash NOW for it) and I want to be able to plug in my new iPhone 5 and restore it from my backup and pick up right where I left off on my iPhone 4.