Saving Form Data for more than a couple weeks

I believe that data on an un-submitted form is saved in the browser for only a couple weeks.  Is there a way to set it to save the data for 5 months?

I have about 15 forms that a person needs to complete and submit at the same moment and once it's submitted, the form data clears which is fine.

I created a form that they use as a check list so they can keep track of the forms they have completed and submitted over a 4 month period.  The check list has check boxes and field for a date for each of the items they need to send. 

There is NO SUBMIT button on the Check List form so it wont be submitted and cleared. 

How can I have the browser keep the data longer for one form?
I understand that the person needs to use the same browser each time.

Since the forms are only used from February to June, after 6 months, the form can clear and be ready for February next year.

Thanks!

This is possible using the Save session method workaround.

Check the user guide: How to Save Forms and Continue Later

Unlike the Autofill tool, the save session method will be saved at JotForm side. So unless the form was finally submitted, the saved session will still be available up to 3 months(unfortunately the temporary saved data cannot be saved forever).

Do take note of the different requirements when using this workaround method (i.e. multiple pages form, page break field required)

I hope this help. Let us know if you need further assistance.