Does the backup have to be running the same OS as the new iPod? My iPod is running 4.0, and I want to transfer the save data from this to the new iPod coming out tomorrow. We could possibly see a 4.1 update for the iPod/iPhone, so if the new iPod comes with this then does my backup file have to come from a 4.1 device, or will it work from 4.0?