Seems like it takes FOREVER to back up my iPad when I sync mine. I mean forever: like 45 min. And I have a measly 16GB, of which about 2GB is free. Is it my computer? Or is this normal? Also, is there a way to tell iTunes NOT to back up my iPad when it syncs? I mean, it seems like backing up is something I might need to do only once every three times I sync.