If you have a fantastic email template that you would like to re-use and just change the content, you can easily duplicate your existing template. This works especially well for things like regular newsletters and keeps your branding consistent.
Navigate to Emails > Email Templates. Click into the name of the email template that you wish to duplicate.
From the Actions menu on the right-hand side, select Duplicate Template.
This will create an exact copy of your first email template (including link automations) that you can rename and edit.