Error 0x8007173D

Value: -2147018947 | 0x8007173D | 2147948349

What does it mean ?

ERROR_CLUSTER_BACKUP_IN_PROGRESS  
Back up is in progress. Please wait for backup completion before trying this operation again.
Value: 5949 | 0x173D | 0b0001011100111101

Where does it come from ?

FACILITY_WIN32  
Provides a way to handle error codes from functions in the Win32 API as an HRESULT. (Error codes in 16 - bit OLE that duplicated Win32 error codes have also been changed to FACILITY_WIN32)
Value: 7 | 0x007 | 0b00000111

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