The error indicates that Volume Shadow Copy Service (VSS) could not create the shadow copy (shared protection point) on the source volume. This is commonly caused by issues with the Microsoft Software Shadow Copy Provider (Swprv) configuration.
To fix this, verify and correct the Swprv ServiceDll registry value:
- Open Registry Editor:
- Press Win+R, type
regedit, and press Enter.
- Navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\swprv\Parameters
- If the Parameters key does not exist:
- Right-click swprv → New → Key.
- Name it
Parameters.
- With Parameters selected, check for a value named ServiceDll:
- If ServiceDll is missing, right-click in the right pane → New → Expandable String Value.
- Name it
ServiceDll.
- Double-click ServiceDll and set Value data to:
%Systemroot%\System32\swprv.dll
- Close Registry Editor.
- Run the backup again and confirm it completes successfully.
Editing the registry incorrectly can affect system stability, so ensure only the specified key and value are changed.
References: