Using an external HD and Airport express
I have an Airport Express and I use a Western Digital HD for my Time Machine. Can I use these together to back up my MacBook wirelessly?
AirPort Express-OTHER, OS X Mountain Lion (10.8.2)
The AirPort Express will only support a compatible printer at the USB port, so it will not work at all if you are planning to connect the Western Digital drive to the AirPort Express via USB.