So my GF is coming to visit me at school today and I don't want to have her bring her laptop, but we're gonna be going to the Apple Store this weekend to get her defective iPhone replaced, but I'm not sure if I can just back her white iPhone onto my MacBook. I'm not sure how it works with music especially since I have my own songs on iTunes and she obviously has her own music that she wants to back up and reload onto her new one.