Follow the general steps in the "Excluding files and folders from a backup". Except:
- In the "Include" tab, include the "Exclude all files" script rather than "Backup - all files"
- In the 3rd tab, add the folder(s) you want to copy, and make sure the command in front is copy.
All the other steps are the same. Make sure you use an image, stored on the iPod: don't store directly on the iPod!