No you didnt … thats not how package managers work.
If you grabbed a run file and executed it … you did that manually.
Now you have to undo it manually.
You did this outside the package manager … now you cannot use the package manager for removal because it doesnt know about those files.
One of the many reasons why you shouldnt have done that in the first place.
It looks like its a prompt to ensure removing references to nvidia in Xorg configuration files.
I dont know if you made such changes, or what ‘backup’ it would be restoring.
You would probably want to delete any such configurations entirely.
‘Yes’ would make sense …
(but again I dont know what its ‘restoring’ if anything at all … likely any file it would be removing or restoring you would probably want to delete too)
I dont know. I would expect the script to run and exit when finished.
Ctrl+C is common for ending a process, but you probably dont want to force exit while running.
As before - for more information about this script/utility/driver you will need to ask the people you got it from - nvidia.