Windows Backup failed to get an exclusive lock on the EFI system partition (ESP). This may happen if another application is using files on the ESP.

[Eightbitsshort]

Hello,

I'm trying to set up a scheduled task to backup a domain controller. The DC is a Windows Server 2012 R2 virtual machine. I have the scheduled task configured to run the following command:

wbadmin start backup -backupTarget:M: -allCritical -systemState -vssCopy -quiet

But the task fails with the following eventid

Log Name: Application
Source: Microsoft-Windows-Backup
Date: 9/27/2019 2:00:57 AM
Event ID: 517
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: Computer-name
Description:
The backup operation that started at '‎2019‎-‎09‎-‎27T07:00:16.502904800Z' has failed with following error code '0x8078011E' (Windows Backup failed to get an exclusive lock on the EFI system partition (ESP). This may happen if another application is using files on the ESP. Please retry the operation.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

I don't know EFI system partition it's referring to. I've tried restarting the server in clean boot and the task still fails.

Any help is appreciated!

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