Update to iOS 5.O, you will find out the new iMessage app built in the iPod touch or iPhone. It can allow you to send SMS freely if you had Apple ID. Most of the iMessage files such as Text, Video, Photo, Link, Contact, Email, etc. can be delivered or accpeted. But here for those files, and iPod/iPhone beginner, it is necessary to backup iMessage files on PC? Follow this article and learn more info about the solution on how to transfer iMessage files from iPod iPhone iPad to computer step by step.