Hi
That was a quick reply

That was my plan - basically to put the system back together as it was but with the s/h NAS (and original HDDs) in place of the dead one. I didn't setup the C10+NAS orignally, so I need to check if the C10 was set as a core - I guess it was. Will need to power it up again and check.
So, as you saying there are TWO different Sooloos plug-ins for the QNAP?
But presently, the C10 and NAS box do not see each other on the network, though I can access the NAS directly (via a PC) so I know it is working OK.
Regards
Tom