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Win Server 2012 - Windows Backup. Backup of volume D: has failed. The mounted backup volume is inaccessible. Please retry the operation.

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Hello guys

First post ever here! Hopefully someone here can help

I am running Windows Server scheduled backups from a Hyper-V Physical Host which is backing up the Physical Drive

I have 2 external 1.8TB Hard drives which just plug via USB into the physical host and it backs up over night

Backup Hard Drive 01 works fine - and it is backing up without a problem, however Hard Drive 02 is failing constantly

I have run a scan on Hard Drive 02 and there are no errors, this is the vent viewer log:

Log Name:      Application
Source:        Microsoft-Windows-Backup
Date:          2/12/2015 5:17:28 PM
Event ID:      517
Task Category: None
Level:         Error
Keywords:      
User:          SYSTEM
Computer:      MCEC-HV1
Description:
The backup operation that started at '‎2015‎-‎12‎-‎02T06:00:06.277088800Z' has failed with following error code '0x807800C5' (There was a failure in preparing the backup image of one of the volumes in the backup set.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Backup" Guid="{1DB28F2E-8F80-4027-8C5A-A11F7F10F62D}" />
    <EventID>517</EventID>
    <Version>1</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2015-12-02T06:17:28.601253900Z" />
    <EventRecordID>20615</EventRecordID>
    <Correlation />
    <Execution ProcessID="236" ThreadID="4556" />
    <Channel>Application</Channel>
    <Computer>MCEC-HV1</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="BackupTime">2015-12-02T06:00:06.277088800Z</Data>
    <Data Name="ErrorCode">0x807800c5</Data>
    <Data Name="ErrorMessage">%%2155348165</Data>
  </EventData>
</Event>

I am not sure what else is going on, I thought it may have been a bad backup drive but I tested it and its not finding any errors

backup Drive 01 is working fine


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