If anyone has any reliable stats or links please enlighten me...

It is my understanding that EMP is fairly localized. Meaning one pulse can not take out the US or even your state. If you work in, and carry your IPod in a high risk area - Military Post, Wall St., etc. - then your best solution happens to be prudent advice anyway - Keep an offsite backup!

There are three sure things in life... Death, Taxes and Data Loss. The first you cannot avoid, the second you can minimize and the third? Backups.

Offsite backups are cheap and simple. You just have to make yourself do it and update them regularly. DVD burners are cheap. DVDs are immune to the effects of EMP. And if you are really worried send a couple of backups to your brother-in-law on the opposite coast or in another country.