THIS IS NOT THE SOLUTION - but works temporary
Under policies edit group where the server is located, edit "Protection Settings" and disable "Behavior Protection" then the server's backup is stabilized and my error is gone.
Function: Behavior Protection
Description: Detects and blocks malware based on behavior analysis
So, from my point of view, it seems that it is "only" ArwSdkShim.dll (version: 3.1.0.502) that has a difference compared to your setup Denis.
This, of course, I will take on to Malwarebytes in my case ID.
Thanks Again Denis.
/ElektroAdmin