I managed to lose my iphone 3G yesterday and following this, my wife decided to have hers backed up just in case. We both have our individual accounts which are recognised by itunes. Am I correct in assuming that music is shared but address book contacts are kept separate? I'd hate to wipe my phone's backup before the replacement arrives and I am able to restore and recover all my data. Can I safely backup and upgrade my wife's phone (to OS4.1) without worrying about my profile being wiped?