Scenario: I'm at my place. So is a friend. She plugs her iPhone into my MBP. iTunes starts and tells me there's an update available. Said friend, for financial reasons, does not have real internet access at home and simply uses iPhone tethering when she needs Internet access on her Macbook. So, I want to do her a favor and install the latest iPhone firmware update. On MY MBP. Now, can I force a backup of HER iPhone to my MBP by right-clicking it in iTunes, do the update, then restore? I'm always afraid to move forward with this type of thing because the goal, of course, is that the update go smoothly and the friend not even notice (except for new features etc.) that I did anything. Would this work? Is there an alternative method? Thanks!