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Unfortunately, we don't keep a backup of the submissions so if you have deleted them from the form, I'm afraid that there's no way we can recover it for you.
For deleting all and selected submissions, you will be prompted with a warning message. And delete buttons are different for both options.
For deleting the entire submission, you'll see the "Delete All Submissions" button:
For deleting selected submissions, you will see the "Delete Selected Submissions" button:
Or, you can just click "X" button to delete a single submission.