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The error in the Exchange backup report is as follows:  

The writer vetoed the shadow copy creation process during the backup preparation state. (VSS_WS_FAILED_AT_PREPARE_BACKUP) 

This problem is external to the backup software service, but here are several suggestions to attempt to resolve. 

  • Run "vssadmin list writers" to find which writer is having issues. See this MS kb article
  • Restart the "Volume Shadow Copy" service via services.msc
  • Restart the "SQL Server VSS Writer" service via services.msc
  • Check the Windows event viewer for more details 
  • Re-register backup software with the VSS service by running "C:\Program Files\backup software Advanced\bin\RegisterVSS.bat"
  • Reboot the server to clear.
  • Verify "Circular Logging" is disabled on Exchange
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