Mybook World and TV Live Hub - backup or mirror

The MyBook World (white) and TV Live Hub are both 1TB drives. I would like to either mirror them or back one up to the other. Appreciate suggestions on best way to do this. If it matters, I prefer to use the MyBook as the primary server since it is faster.

Thanks,

Claudio

Not sure if you can do a mirror or a backup as the devices are designed for different purposes.

As a recommendation, copy the files manually over the network.