KB2918371 – Scheduled Backup Of Hyper-V Fails With Event ID 517 & Error 0x80780049

This new article from Microsoft refers to “Windows Server Backup running on the host operating system”, but I cannot say if this issue affects third party backup tools, DPM or not. REPEAT: DO NOT ASK ME – ASK MICROSOFT. Very often Microsoft has a bad habit of stating that a backup fix is for a scenario featuring a Microsoft backup product, but it really affects any tool backing up Hyper-V.


Consider the following scenario:

  • You have a Windows Server 2012 hyper-v host and a Windows Server 2012 guest virtual machine (VM).
  • You start Windows Server Backup on the host operating system.
  • You click Backup Schedule to start the backup schedule wizard and then click Next.
  • You select Custom on the Select Backup Configuration tab and then click Next.
  • You click Add Items, select host component and the guest VM, and then complete the wizard.
  • You restart the host operating system.

In this scenario, scheduled backup fails with event backup ID 517 and error 0x80780049.

“The Update” fixes this issue for Windows Server 2012 R2 Hyper-V and Windows 8.1 Client Hyper-V. A hotfix is available for Windows Server 2012 Hyper-V and Windows 8 Hyper-V.

If the problem is limited to Windows Server Backup then it will typically affect just small installations (1 or maybe even 2 hosts) and labs.

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