Can I save a form to continue later?

We want to create a form that our cleints will complete over a period of time - up to a year. Some would not be using the same computer each time. Is there a way they can save their form and log in to continue writing it. Also if they choose to submit what they have written so far but still log in and add more a few weeks later, is that possible. if so how?

many thanks

Yes, it is possible by using the method "Save forms to continue later":

https://www.jotform.com/help/97-How-to-Save-Forms-and-Continue-Later 

With this option you create a first form that will collect the email address and will create a session, so that user can use the link to edit the form.

Let us know if we can assist you further.