So here's my situation: have an imac, an ipad and 2 iphones. Wife and I share the ippad and imac and we use her apple ID for all itunes purchases, all homesharing between apple tv, etc... its her primary yahoo account. I have a mobile me account that I use for calendar and email on my iphone and the ipad. her phone and the i[ad are no big deal, I'll use her ID to set up synch and icloud. for my phone, how should I set it up, to make sure I can back up etc... I don't use my me.com apple id for ANYTHING but email.