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.
If you delete submissions using the "Delete" buttons in your submissions page, then you won't be able to get them back. The data is owned and managed by our users, if you decided to delete them, they will permanently be removed in our servers without any backups. You'll see a warning message when you delete a submission:
Also, we do not have a record if a submission has been deleted, however, you can check your account's activity log if there are any suspicious and unauthorized access or changes made in your forms: https://www.jotform.com/help/370-How-to-View-Your-Account-Activity-Logs
The only thing that you can use as a reference for the deleted submissions are the email notifications sent to you.
If you accidentally deleted a whole form, it is still possible to restore it as long as it is not purge. Here's a guide about it: https://www.jotform.com/help/134-How-to-Restore-Deleted-Forms
I hope that helps.