I understand that the form automatically saves itself for a week after the respondent first starts it.

If a week has passed, is there any additional backup copy to it? Thanks!

Once the form is submitted, you can get a copy into your email after creating a notification . You can also access to this information via your account. Please check these two guides for further information

https://www.jotform.com/help/25-Setting-Up-Email-Notifications

https://www.jotform.com/help/374-How-to-export-all-of-your-data-at-once

The data is available for as long as you do not max out your available space, which is 10 GB.  You

https://www.jotform.com/help/374-How-to-export-all-of-your-data-at-once