Some USB enclosures have a button to start the execution of an associated program. If you have such a device, you can configure Backup4all to execute a backup job or a backup group when this button is pressed. If your One Touch Backup device is not detected by Backup4all (Backup4all is not natively compatible with the device), you could use the command line parameters to create a command that can be associated to the One Touch button of your device.