This article summarizes the steps needed to fix the error ID 10102, Hyper-V VMMS (Microsoft-Windows-Hyper-V-VMMS) “Failed to create the backup of virtual machine”.
There are various reasons why this error may occur:
- Virtual machine files are stored in root folders of a drive or mounted folder. If that’s the case please move all Hyper-V virtual machine files into a subfolder. This is a well-known bug in Hyper-V and affects backups with various error messages. Do not store VHDs and other VM files in root folders.
- The VM’s disk may be nearly full
- The host’s disk may be full, either the system drive or the drive containing the VHDs or both
- The VM’s snapshot folder is set to a root folder (variant of #1)
- The VM’s snapshot folder volume is full or nearly full
- A VSS aware service inside the VM vetoed live backup, such as SQL Server, Exchange, etc. Please inspect the VM’s Event Viewer logs (Application & System)
Apart from event ID 10102 in Microsoft-Windows-Hyper-V-VMMS you may see additional errors being logged. Usually the first error is the key to the solution and all other errors are consequential.
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