Forgot to answer in time.
I found a working solution on a steam forum:
Go to Windows Defender Security Center and go to Virus & threat protection > Virus & threat protection settings
and look for something like "controlled folder access" and make sure that is toggled to OFF.
Search found 3 matches
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When I restore game saves (*.gsba) via GameSave Manager, it says that the restore task was completed successfully. But when I open the games or even destination-save folders (for example - C:\Users\ me \Documents\American Truck Simulator) I can’t see the "restored" save anywhere. GSM - 3.1.455.0 Win...