I am currently using a PC + iTunes to sync with my iPod Touch. All my apps are on that PC. However, I would like to transfer my apps and sync with my Mac. I plugged the iPod Touch into my Mac and try to sync however it says it will erase all of my iPod Touch's apps and sync with the ones on my Mac in which case there are none yet. I don't want to lose all my save data on my installed iPod Touch's apps. Any idea?