Revision of Form that does not overwrite original form creates an editable copy

I have a InfoPath form 2010, that is being published on SharePoint 2007. Currently once the user submits a form and the form is then reviewed and I have a text box to change it to approved upon this change the fields become read only which I did with conditional formatting.

What is the best way to then allow the user to edit the form and save it as a new item in the library, without the loss/compromise of the original form?

Thanks in advance!