How do I retrieve something that was deleted accidentally?

Hi,

If you deleted a form, it should still be available in you trash as long as you have not purged it:

http://www.jotform.com/help/134-How-to-Restore-Deleted-Forms

If you deleted submission data, there is, unfortunately, nothing we can do to recover it.  You may be able to get the data from your email history if you had a notification setup for the form:

http://www.jotform.com/help/293-How-to-view-all-your-form-Email-History

Other than that, we do not keep any logs or backups or your submissions once they are deleted.