Hyper-V was installed and the VMs put on their own volume.
Backup started failing only when this volume was backed up. The error initially showed up as:
VSSAdmin list writers showed Hyper-V writer problem.
The source error was one I had never seen before:
No snapshots to revert were found for virtual machine….
After searching around the answer was to enable Automount on new volumes...
After that the backup started working perfectly again…
OS upgrades often leave these gotchas behind so it can be more time effective in the longer run for a fresh install.
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