my laptop with all my apps,music,videos, photos, etc. has been playing up. so im switching my itunes library to another computer. ive been able to copy all my music over but not my videos and photos. thats one question how do i switch movies and photos over, but the main question is that i have also been able to switch apps over by tranfering purchases. but if i sync my apps with my new itunes library will it erase everything on my ipod and overite all the save data from the apps?