Enabling revisions for Contact Form 7 forms

Hi All

I have a client who has changed their mind a few times and then wanted to go back to earlier versions of the CF7 forms. Having to copy out the form, save the file in an external place can be a bit much. Is there some sort of way of turning on a revision history so you can step back to earlier versions of a form that was created? It would probably help a lot of people out there.

Peace and props to all.