How to clone an email template?

Go to ADAMIN → Settings → Email Template 

When you press the "Email templates" button, a list of templates will appear, select from the list the template you want to clone and press on the "Edit" button.

Once you are on the edit page of the selected template to clone, press on the "Clone this template" button.

Then you may edit and work on the cloned template. Now you will see the cloned template on the list of email templates.