JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
This is possible depending on the software your user are using to fill up the form. If they are using Adobe PDF Reader, then they can save the data they have inputted on the PDF file and then just open the file again anytime to continue it. For more information, you can check this article: How to Save Fillable Form data in PDFs.
Do let us know if you need further assistance.