I'm not 100% sure about your question, but I'll go ahead and answer. While obviously you're going to need the core/hybrid running at all times to have DHCP and the other functionality, you can shut down all the Media Directors (thin clients) and wake them up as needed via WOL (assuming your MD supports it). As far as NASs go, I don't think the WOL functionality has been extended to support those. I don't even know if most of those even support WOL. But if you are using a PC as a NAS, it might not work out of the box, but it sounds doable.