The VSS_SNAPSHOT_STATE enumeration defines the set of valid states of a shadow copy.

 typedef [v1_enum] enum _VSS_SNAPSHOT_STATE
 {
   VSS_SS_UNKNOWN = 0x00000000,
   VSS_SS_CREATED = 0x0000000c,
 } VSS_SNAPSHOT_STATE;

VSS_SS_UNKNOWN:  The shadow copy state is unknown. This is a restricted shadow copy state. Shadow copies that are managed with this protocol MUST NOT appear in this state.

VSS_SS_CREATED:  The shadow copy is created.