Dennis @ PerfectForms
You could write a script that on submission would print and save to the local file system (PerfectForms’ professional services could do it for you as well). The challenge is that you want to do it after the fact. You would have to modify the form, map the old instances to the new version and then create a parent form to open all the old instances so they could submit and print.
It would be much easier to simply export the instance data to CSV. It will be in our schema, but we have already built the functionality for you as described in our help guide: /Documentation/manual/html/?d_exportingformsandformdata.htm