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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.".

Jason Lawrence

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