Gets the IProcessingUnitInstance that holds the backup ISpaceInstance, 
            or null if this processing unit has no embedded space.		
            
| C# | Visual Basic | Visual C++ | J# | 
IProcessingUnitInstance Backup { get; }
ReadOnly Property Backup As IProcessingUnitInstance
property IProcessingUnitInstance^ Backup { IProcessingUnitInstance^ get (); }
/** @property */ IProcessingUnitInstance get_Backup()
