The only things I find on my C: disk are in My Documents. I have a CFSWW1 Over Flanders Fields folder, with inside 3 folders Campaigns Missions and Quickcom. All these folders are empty.
Since the pilots data are stored in the Campaigns folder of the game install, what is the use of these empty folders ?

As I have everything at hand to reinstall quickly, I only backup the pilots inside the campaigns folder of the OBD software install to keep track of my pilots. Did I miss anything ?

Yes, you did, Corsair.
The pilots won't work that way, when you start it again.

There are more data under

(your computer name) > AppData > Roaming > Microsoft > CFSWW1 Over Flanders Fields

OK thks, I already have my Total war files there... will have a look !

PS : Ok found them and backed up as well...