I sold my iPhone 3G and got the new iPhone 4. I synced all my apps from my 3G with my iMac and I would actually like to reformat my iMac (spring cleaning) without losing my apps. Can I transfer my apps from my iMac to my iPhone 4, and then retransfer my apps from my iPhone 4 to my freshly formatting iMac? Or is there a better way to backup my apps before I format my iMac so I don't lose them? Thanks.