Loner T!!! I did it. When you have your Bootcamp on your internal drive and the C: system externally on Thunderbolt SSD, I always thought there must be a way to clone C: to another external SSD drive to have a back up, for plug and play as people say. Well, I talked to you, no solution, I tried everything!!! I tried Paragon, Acronis, Clonzilla and all the usual suspects, to no avail! Finally, I bought another SSD drive just to free up my MacOS X SSD back up for experiments. I cleaned the drive under Window 10 diskpart select disk clean all. Then I used HDD guru raw copy toolto clone my external system to the clean drive (sector by sector) under Window 10 (independent machine with both source and target disk attached via Thunderbolt). Then I switched my system drive on external SSD for the copy. Man, Windows 7 started up like a charm. It asked me to perform CHKDSK which I did. Thereafter I restarted, and man, I had my system back as a carbon copy of the original drive. I succeeded to clone bootcamp C: which even Winclone is unable to do. Now, if my system fails, I just plug in the backup drive and I am back running. I make all my money from remote consulting, so this is a life insurance. I hope others can profit from my experience.
Cheers. pentelho