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Windows server 2016 Hyperv-V Backup error "0x8078004F"

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i am using Windows Backup and trying to backup to NAS folder and worked fine, but now windows backup is failing with error code "0x8078004F"

The backup operation that started at '‎2021‎-‎06‎-‎19T18:00:07.880845800Z' has failed with following error code '0x8078004F' (The mounted backup volume is inaccessible. Please retry the operation.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

Event viewer says: Application backup Writer Id: {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE} Component: 15ACC6A2-F544-4B2E-A3D7-55639A815409 Caption : Online\Server Logical Path:

Backup works only for local hard drives (bare metal, c, d) and fails when backup start to copy Hyper-V. Only option to backup hyper-v is on externel USB HDD. Backup do not works on network folder. I tried to change location to another NAS, but i still have same error.

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