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A Backup or Replication job using Application-Aware Processing fails with an error similar to:
The VeeamVssSupport service cannot be installed because the VeeamVSSSupport service is still present from a previous job run and is marked for deletion by the OS. The service becomes marked for deletion by the OS when the OS fails to process the service delete request that the previous job run sent. By default, Non-Persistent Runtime Components are used by Veeam Backup & Replication when performing Application-Aware Processing. A connection is made to the Guest OS during each backup job run, and the VeeamVSSSupport service is installed. When the VM is done being processed, Veeam Backup & Replication sends a request for the VeeamVSSSupport service to be deleted.
Reboot the VM's guest OS to allow Windows to remove the VeeamVSSSupport service that is marked for deletion.
This error may also occur if certain critical OS services cannot start because they've been disabled. Volume Shadow Copy — Default Startup Type: Manual Windows Management Instrumentation — Default Startup Type: Automatic COM+ Event System — Default Startup Type: Automatic
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