since an update installation at the 29th May (KB5001402, KB5003197 & KB890830) our backup of the Hyper-V guests doesn´t work anymore.
Windows Server 2016 Standard 1607 build 14393.4402 - Hyper-V role (with GUI)
The backup started the VSS and after seconds the VSS crashed with the event id 517 0x807800C5.
After restart the behavior is the same, but with error 0x8078004F (instead of 0x807800C5).
Fehlerbucket , Typ 0
Ereignisname: Windows Server Backup Error
Antwort: Nicht verfügbar
We tried several local backups, failed wit the same message.
We checked the VSS environment without any results. Did it with Acronis VSS tool, too - no results.
Switched off the security software didn´t change anything.
I appreciate your help.