Can I backup my iPhone to a new Mac with a blank iTunes. I want to transfer info to the new iPhone 5 next week. I normally backed it up on an iMac that I sold a few months ago, and made a time machine backup of that iMac. Now I have a fresh MacBook Air with a fresh blank iTunes. What's the best way to get my info from my old iPhone 4 to my new iPhone 5 when I get it? Thanks!