I just got a new Mac. It has itunes 10 pre-installed on it. My old computer is a windows based and my iphone is synced with that old computer. I used the spirit jailbreak on my iphone 3G. It is running ios 3.1.2 . I would like to continue using my current cydia apps (most importantly mywi 4.0) How do I back up my cydia apps with my new mac when my iphone is synced with my old windows based computer?