JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Unfortunately there is no option to restore deleted submission data as we do not keep another copy of them except what is existing.
When deleting submission data, there is always a confirmation prompt screen that will ask for deletion confirmation. If you proceeded deleting the submission even after the confirmation screen, the submission will be permanently deleted.
The option to recover deleted submission is thru the submission Email. The form submissions usually have the equivalent submission email that you can use to get the data.
You can also check in your sent Email History logs the same recorded submission data.
user guide: -How-to-view-all-your-form-Email-History
Let us know if you need further assistance.