In order to restore full account, go to full account backups on the cPanel-JetBackup menu.
Choose your desired backup to restore from and hit the restore button.
You will have to approve the restore conditions and then hit the add to restore queue button.
This will TERMINATE the selected existing account. The account will be recreated and restored using the backup. ALL data created after the backup restore point will be permanently lost.
You will see a message that your restore added to the queue.