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  • File backup failure with "unable to flush I/O writes"
    If you are facing “File backup failure with "unable to flush I/O” issue then this error may be as a result of an issue with the VSS subsystem on the Agent machine or Hyper-V host caused by VSS not being able to quiesce data to the disk within the VSS timeout window. And the solution is to switch to “use system VSS provider.".