71411: Acronis Cyber Protect: Agentless backup of Hyper-V machines fails if virtual machines are stored on Microsoft`s Storage Spaces Direct (S2D)

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Last update: 03-11-2022


  • You are using Microsoft`s Storage Spaces Direct
  • You are trying to preform an agentless backup of a Hyper-V VM
  • The backup fails with: "| error 0x9: There is not enough space in the storage area to create a shadow copy repository file or other shadow copy data."
  • Also other errors regarding VSS are to be expected.


This is an expected behavior caused by known limitation of Microsoft`s Storage Spaces Direct (S2D): Agentless backups via Hyper-V host are not supported for that type of Hyper-V storage. More Information can be found in this Microsoft Article


To resolve the issue, do the following:

  1. Install Agents on guest virtual machines
  2. Perform backups via agents only.