I've been searching for a solution to my specific problem, but I haven't really found any answers yet. I have an iPhone 4, which I used to sync to my now-dead (PC) laptop. Right now I can't (and may not ever be able to) access the files that are on the hard drive of my dead laptop, because the hard drive might be dead for good. I have all my music on an external hard drive so thankfully all of that is safe. I haven't been able to back-up my phone for at least 2 months. My problem is that I currently don't have my own computer to use, so I have to use my mom's computer (PC) for the time being. She also has an iPhone that she syncs to iTunes on her computer, but she uses a different Apple ID than I do. I was hoping I could sync my phone to her computer so I can back it up and update to iOS 5. I don't know how to go about setting up my iPhone to sync on her computer without running the risk of wiping all the data on my phone. Is my solution as simple as logging out of her Apple ID and logging in under mine and then setting up my iPhone as a new phone in iTunes on her computer? Or is it more complicated than that? I'd also prefer to have only MY phone's files to back up onto my external hard drive so it's easier for me to set everything up later once I get a new computer.