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I'm trying to setup Windows Backup to backup my laptop to a network attached storage drive. The backup runs for about an hour an then fails giving error code 0x8078015B.

When I checked the windows error log I find the entry I've listed bellow. Any one any idea how to resolve this? If I have to disable services one by one it could take me weeks to figure out what is causing the issue.

Log Name:      Application
Source:        Microsoft-Windows-Backup
Date:          15/10/2010 22:13:50
Event ID:      517
Task Category: None
Level:         Error
Keywords:      
User:          SYSTEM
Computer:      Laptop
Description:
The backup operation that started at '‎2010‎-‎10‎-‎15T18:06:13.550844800Z' has failed with following error code '2155348315' (Windows Backup encountered an error when accessing the remote shared folder.). 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>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2010-10-15T21:13:50.478235300Z" />
    <EventRecordID>121885</EventRecordID>
    <Correlation />
    <Execution ProcessID="7968" ThreadID="5460" />
    <Channel>Application</Channel>
    <Computer>Laptop</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="BackupTime">2010-10-15T18:06:13.550844800Z</Data>
    <Data Name="ErrorCode">2155348315</Data>
    <Data Name="ErrorMessage">%%2155348315</Data>
  </EventData>
</Event>
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2 Answers 2

Are you backing up any remote shares?

This "0x8078015B - Error when accessing the remote shared folder" seems to be the only thing I can find with that error code along with a solution.

Hope it's of some use.

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+1 I love it when people use my sites for reference! Hope the solution (delete your old backup before backing up) solves the problem. –  tsilb Dec 7 '10 at 19:40
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I went through the same problem, but found the answer today. Go manual, pick the harddrive you want to save on, then when you reach the list of the file with the checkbox, outside the the central square of the window there's another checkbox. Uncheck it and it should work, that's what it did for me.

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He means the "Include a system image of drives: [list of system drives]" option –  Mufasa Jun 21 at 17:32
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