Hi i have updated my original aluminum macbook to the newest OS which is 10.8.5 but i find it has made my mac very slow and everything is a little laggy, my question is the next, if i want to restore my macbook to its original snow leopard but keep itunes and my iphone the same what do i do? i mean when i go back to snow leopard i want my itunes and iphone to act the same without deleting anything from my iPhone when i connect the usb again? i heard if if the iphone thinks its ah new computer it will delete everything 