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I have a Windows 8 PC with two network cards installed. One is my normal card connected to a router, the other while also connected to the same router is meant exclusively for use by Hyper-V / Hyper-V guest OSes (I'm a developer and I need to test multiple OSes / browsers).

I'm using the Windows 7 Backup to do a backup to my server, and it's been failing since I installed the second NIC. I think it might be trying to use the second NIC (which shows Limited connectivity)

The backup fails because "An unexpected network error occurred." Error code is 0x8078015B

Disabling the other NIC (the one used by Hyper-V) didn't solve the problem.

The PC was running Windows 7; the backup worked properly then and for a while after upgrading to Windows 8.

The event log shows basically the same thing the Action Center does: "The backup did not complete because of an error writing to the backup location \server\clientbackup\workstation. The error is: The backup location cannot be found or is not valid. Review your backup settings and check the backup location. (0x81000006)."

What do I need to do to correct this issue so the backup completes?

share|improve this question
If you want to be certain try disabling the nic while you run your backup. – Col Mar 30 '13 at 13:43
@Col I tried that, and the backup still failed. – Andy Apr 6 '13 at 13:35
Windows backup has always been very flaky, and in addition in Windows 8 Microsoft tried to kill it off. I would really advice using another product. Another option is of course going back to Windows 7. – harrymc Apr 6 '13 at 14:23
Can you post what is logged in the Windows Error Log for this problem? – Afzal Apr 6 '13 at 16:31… ? Apparently that error means the problem occurred on the server side, or at least Windows Backup thinks it did. – Mark Allen Apr 12 '13 at 19:58

I don't have high enough rep to comment so I am asking a question here. Are you trying to backup this data to a Windows XP Server or a Windows XP computer? IRPStackSizeis the variable that is breaking your transfer if you are going from 7 to XP.

Also be sure to delete the old image before copying right over it.

share|improve this answer
No, the server is SBS 2008. It's never had to delete the old image before. – Andy Apr 9 '13 at 11:46

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