The answer to your question, as written, is contained in PAF5 Help under "How to create GEDCOM files". Do a search in Help and you should see that topic a few subjects down.
But you have brought up an interesting point. It is apparently not possible to save zipped backup copies from PAF5 in PAF4 format. Gedcom, with the Ansel character set, is used for exports from PAF5 to PAF4.