Challenge
Guest VMs will fail to engage VSS when Application-Aware Processing is enabled, generating the error:
Error Guest processing skipped (check guest OS VSS state and integration components version) (System.Exception)
Cause
This issue has multiple potential causes, usually related to the Integration Services version of the failing guest server. This issue occurs when Application-Aware image processing is utilized in the Backup or Replication job settings for transactional quiescence using Microsoft VSS
Solution
Please Note:
A list of supported Guest OSes for each version of Hyper-V can be found here.
On 2008 R2 hosts, Application-Aware Processing during backups is not supported for guest VMs running Server 2012 R2 or later due to integration components incompatibility.
If the Host is 2008 R2 and the VM Guest OS is 2012:
View the Guest OS Application Event logs for errors with source: vmicvss and Event ID: 13.
If this error is present, open the Registry Editor (regedit) and navigate to:HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\SystemRestore\
Within that key, create a new DWORD
Name: ScopeSnapshots
Value: 0
Note: If the SystemRestore key is not present, you must create it.
