Tom

You could use your C10 as the Sooloos core, did you have a backup of your library that was on the NAS, how big is your library?
There is some good information here on migrating data to a new QNAP NAS you should be ok and be able to just move the drives.

I can’t help with the Sooloos QNAP packages but am sure someone will be able to.
You may want to consider Roon as an alternative to Sooloos?