For saving a form via workflow processing, a certain logic must be implemented in the workflow. The button (btnSave) used for saving is in that case configured to "submit" or "submit + check" in the action.
In the workflow, the trigger btnSave send an e-mail to the enterted e-mail address with the url for the stored form. The action "Save" sets the form to the saved state. Optional you can use the action "Move to inbox" to save the form in a own inbox to separat the saved forms from final sent forms.
After the form was saved an action of the type "Redirect" is used to instantly open up the saved state of the form again.
Furthermore this demo form also uses a timed state transition to delete saved form records 2 days after they have been saved for the last time.