OPERATIONAL DEFECT DATABASE
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A Backup Job for a Windows 10 VM running on a 2012 R2 Hyper-V Host will fail to engage VSS when application-aware image processing is enabled, generating the error: Error Guest processing skipped (check guest OS VSS state and integration components version) (System.Exception)
This issue occurs because the integration services on that Windows 10 VM are newer than the integration services on the Server 2012 R2 host.
Disable Application-Aware Processing for the Windows 10 VM and use "Hyper-V quiescence" instead, or upgrade the Hyper-V host. According to the Microsoft article, "Supported Windows Guest Operating Systems for Hyper-V in Windows Server 2012 R2 and Windows 8.1", a Windows 10 VM running on Hyper-V 2012 R2 is not supported.
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