Well for a whole home I don't recommend and WD cloud products, they don't have the performance and cross-platform protocols that make sense for more than 1 computer.

I always comeback to FreeNAS, which I have had configured various ways. I recently updated all my core hardware to mac mini so it has power/sleep modes that save that energy consumption...however payback is a lot longer than a PC..

In the end it will always be a challenge of performance vs. energy consumption.