can your forms be saved?

If a person didn't finish filling out the form can they come back to the form at a later date and finish then submit? 

You can use the save forms and continue later feature. Using this method you create two forms. The first form takes an email address as input. And we use it to create a session id for the second form. Typically this is used for large forms with many pages. And every time the next page button is pressed the form is saved. The user has a link to the session mailed to them so they can continue.

Or you can use the form autofill feature. Using this method the forms field values are saved in the browser (until the form is submitted).