https://social.technet.microsoft.com/Forums/windowsserver/en-US/1a1e0066-f421-43d6-970b-1e20e674cdf9/using-windows-server-2012-backup-for-hyperv-virtual-machines-error-80780176-the-specified?forum=winserver8gen
原文：http://www.cnblogs.com/zjoch/p/4122515.html