Backup fails with the following message:
Windows error: (0x800703FA) Illegal operation attempted on a registry key that has been marked for deletion
This problem typically occurs after an administrator uses a service account to log on to the server for an interactive session, and then logs off. This activity forces the registry keys to be unloaded in the profile of that account. This condition makes the keys unavailable for future use and Acronis Backup cannot access them.
See this Microsoft Support article for more information
Disable the Windows User Profile Service feature that unloads registry keys after logoff. To do this, follow these steps:
- Open the Group Policy editor (Gpedit.msc) on the affected server.
- Open the UserProfiles folder in the following path: Computer Configuration > Administrative Templates > System > UserProfiles
- Locate the Do not forcefully unload the user registry at user logoff setting and change the setting to Enabled.
- Restart Acronis Managed Machine Service (Start -> Run -> type services.msc -> find Acronis Managed Machine Service in the list of services, right-click on it and select Restart)