My wife currently has an iPhone 3G. She has some pretty old software on there and really needs to update to the most recent software. She previously would sync with her laptop. Her laptop is not completely fried, and we can't afford a new one quite yet. I have an iPhone 4 that I sync on my Mac. We have totally different music, calendars, contacts, etc... on our phones. Is it possible for me to plug in her phone, update software, and keep all of her old stuff from her phone saved in like a backup file or something so that I can just drop all her old music, pictures, contacts, and calendar back onto her phone instead of it updating her phone with all my stuff? Or is there an easier/better way to do this?