STC error code #50: The request is not supported.



This article discusses the error STC failure occurred mid transfer. - Final error (-50 The request is not supported.)


  • ShadowSnap is trying to back up a volume that may not be actively recognized or supported
  • Many times this happens when attempting to back up FAT32 partitions or older volume types. It can also occur if the volume is of the ReFS format



  • Exclude the incompatible volume types, and attempt a backup again.
  • Determine if ShadowProtect will exhibit the same error by performing a ShadowProtect backup against the same volume.
  • If this fails as well, exclude the volume from backups. Then, attempt Windows Server Backups against these volumes.

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