My old "main" PC died last week and the new one arrives today. How do I go about setting up Itunes on the new PC, making it the "main" PC? My concern is the second I plug in my Iphone it will wipe it during sync, won't it?. I need to update to iOS5, and again, don't want to lose all my apps, data, pictures, etc. I can creat a backup- but that's not a full restore point, is it?