Here I am with some further details. First of all I recovered about 99% of the disk content, and that's so good. I spent a few hours to re-create the original folder strcture, since most of the files were in different folders (but thx god keeping the original filenames).
I share here some screenshots from DMDE, hopefully someone could help me to understand the best way to move on, if it happened again (I don't hope so!...)
Thx