PC backup - Office templates
To make a backup copy of your email templates you will need to use File Explorer. Select View Hidden Files and go to your C:/Users/StarID/AppData/Roaming/Microsoft/Templates folder to see your Office Templates.
The .oft files will be your email templates.
To make your Office Templates available to you that were on your old computer. You will need to copy these files to your new computer in the same location as noted above.