Hyper V backup failing

Let's start with two non-destructive checks you can run from inside the problematic virtual machine:

Run chkdsk /f****: Schedule a disk check on the VM's C: drive (and any other drives it has) and then restart the VM. This will attempt to find and repair any file system corruption that could be halting the backup process.

Run sfc /scannow****: This system file checker will scan for and attempt to repair corrupted Windows system files within the VM.

If these don't resolve it, the next step is to look at the virtual hard disk from the host level. In Hyper-V Manager, try running an Inspector or Checker on the VM's VHDX files. You can do this with PowerShell (as Admin) on the Hyper-V host:

powershell

Get-VHD -Path "C:\Path\To\Your\VM.vhdx" | Check-VHD

This command will check the integrity of the VHDX file and report if it finds any structural issues.

The most reliable, albeit more time-consuming, solution is often to create a new VHDX, attach it to the VM, and use a tool like Robocopy to migrate the data to a fresh, healthy disk.

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Please give these steps a try and let me know what you find. You're on the right track, and we just need to narrow it down further. If this guidance helps you pinpoint the issue, please feel free to hit "Accept Answer" – it would be great to know what the final culprit was! 😊