Hi,
Would you please try to open CMD as administrator, then run command "vssadmin list writers", check if there's any error, if yes, plesae provide the screenshot of the error message.
Besides, I would like to check that apart from the error message, can we backup the Hyper V server or files successfully?
What's more, please check if the Hyper V host installed the latest windows update, if not, please update it.
Thanks for your time!
Best Regards,
Anne
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