How to save or export user tones

First you need to enable windows folder option to show hidden folder if you're not ready.
Folder> Folder option> View> enable "show hiddne files and folders." and click ok.

Then copy all the files inside this folder in to other location that you will backup.
C:\Documents and Settings\username\Application Data\e frontier\Manga Studio\EX\3.0\Settings\Tone\My Tone

When you reinstall windows and Manga Studio, just copy back all files inside this folder into the same location.