I'm thinking about getting a new nano and I was wondering, will the info on my past runs transfer over to the new ipod when I plug it in, or is it only stored on my nano? I don't quite understand how the info is stored, I know when I plug my ipod in it sends the info to the Nike website and I can look over my old runs on my ipod without the Nike+ device plugged in, so if I plug the device into a new nano will it start over fresh and only record new runs?