Windows Server 2012 , WMI query fails which results in backup failure.

CAUSE

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Windows Server 2012 and Windows Server 2012 R2 have a known issue when they rebuild the WMI namespace. Specifically, both the removal MOF file and the installation MOF file are processed when the standard mofcomp command is issued to rebuild the WMI namespace. This can result in the installation MOF file being processed before the removal MOF file is processed. When this occurs, the WMI namespace is not present after the rebuild.

RESOLUTION

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To resolve this issue use the following steps: 

1. Open an elevated Command Prompt by right-clicking on the shortcut to Command Prompt and choosing Run As Administrator on the host computer. 

2. Use the CD  command to navigate to the  %windir%\System32\Wbem directory. 

3. Run the following command: 

for /f %x in ('dir /b *.mof ^| findstr /v /i uninstall') do mofcomp %x

4. Return to the VMM Admin console and refresh the host computer. 

These steps rebuild the WMI repository on the host. After the next host update in Virtual Machine Manager, the hosts should report that they are in the   Ready state.