Fully Agree with EMIT,
My previous post may have been misleading. As mentioned earlier on the initial Airbus FBW design the mechanical back up was only used to transmit a mechanical signal to the hydraulic actuators for the rudder and pitch trim thus bypassing all flight control computers. It was intended as a temporary configuration in case you loose all flight control computers and before resetting some of them.
No FBW Airbus can be flown without hydraulics.