I'm trying to backup a Steam game's save files using File History on a fresh Windows 10. I'm using an external HDD to back it up. Windows is recognizing the drive, saying the backup feature is active, but when I click "Back up now" to manually do a backup, it successfully runs but doesn't really save anything, just says after that "Your data is not yet backed up", like it couldn't find any files at all.
I'm trying to backup a single folder inside "C:/Program Files x86/Steam/...", so I removed every other folder for which I'm already using a cloud service to backup. I added this folder in the settings app, and also followed this answer, adding this folder to a new library, but nothing seems to work. Every time I run backup it simply doesn't do anything, and the current size of backup is 0 bytes.
Here's the configuration I'm trying from inside the Settings app:
And here is the folder added to a new Windows Library:
How can I correctly configure this feature to back up this single folder?