How do I discontinue a form but keep a copy for possible later use?

You may disable a form in your account so that the form will be made inaccessible and no submissions can be received. You may enable the form later when you need it. Please refer to the guide below that can help you with enabling/disabling the form.

https://www.jotform.com/help/180-How-to-enable-disable-a-form

Hope this information helps!