When a record is deleted, it is permanently deleted from the database.  There are a few options to retrieve the deleted information:
  • Revert to the most recent backup of the database.  Keep in mind that data entered since that backup will be lost.
  • Restore a recent backup on a local machine, pull up the deleted information, and manually re-enter it (or export/import it) back into the live database.
  • Go to Administration > Audit tables and check to see if the data that was deleted was in tables with auditing turned on.  If so, run an audit report for those tables and choose to include deleted information.  Then, re-enter this information onto new records.