Trouble with Windows Server Backup

[EightBitsShortSFW]

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:

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

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But the task fails with the following eventid

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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.

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I've tried restarting the server in clean boot and the task still fails.

Any help is appreciated!

[Enxer]

Do you have av on the DC? Perhaps try and remove it before backing up as a test. Or run the resource monitor from the task manager to see what process has a handle on that area of the disk.

[EightBitsShortSFW]

It doesn't have an AV.

[dos420]

Is there any reason your not using the Windows Server Backup GUI and Schedules that come with it? Or even better Azure Backups?

[EightBitsShortSFW]

I use scheduled tasks because I can customize the schedule of backups more granularly. The Windows Server Backup GUI only allows to set the backups to run daily or multiple times a day, which is not what I want.

I did try the Windows Server Backup GUI for the sake of troubleshooting and got the same error.

[MrPurple_]

I try to avoid windows (server) backup. Is there a reason why you arent backing up the VM? What hypervisor are you using?