After creating a Web Content record (such as a form, survey, subscription page or landing page), you may wish to create another that is very similar to it. This functionality is now available by Cloning the Web Content record. In order to clone the record, simply click the "Clone" button on the ribbon at the top of the record itself. (Settings > Web Content > Open the record > Clone)
This will create an exact copy of the record including any applicable Field and Form Properties, Components, Actions, and Campaigns. For clarity, the new record will say [CLONE]: before the name, but you may change this and save the record. From there, you can make and save changes to the new record while keeping a working copy of your original intact.