Ok, I have received my new 2Tb SDD.
I put it on my ROCK NUC, then formatted it with Web GUI.
I then took it out and connected it to my Mac along with the 1Tb SSD and copied everything over from old drive to new drive.
I just now put it back in to NUC & started it up & Roon seems to be happy with it 
All my music, except for what was on the external USB HD is there, so it seems to have worked 
@Rugby, correct. I did that step before then taking new drive back out of NUC & then doing a local copy on my Mac of all music before putting it back.
I will update my list of steps for other users shortly.
(I am now copying the stuff from my external USB HD over network share so Roon rebuilds it’s database with new file locations)
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