ADD VOLUME PROVIDER ALIAS Adds volumes to the shadow copy set. Volumes must be added one by one. When each volume is added, ...

ADD VOLUME  [PROVIDER ] [ALIAS ]

        Adds volumes to the shadow copy set.

        Volumes must be added one by one. When each volume is added, a check is made
        of whether VSS supports shadow copy of that volume. This primary check may however
        be invalidated by later command of SET CONTEXT.

        Example:  ADD VOLUME C:
                  ADD VOLUME D:

        PROVIDER                Allows you to specify which registered provider is to make the shadow copy.

        ALIAS                   Allows you to specify an alias for the shadow copy ID.
                                If no alias is specified, a default alias of VSS_SHADOW_x is given,
                                where each volume is the x-th in the shadow copy set.
                                An environment variable is created to link the alias to the shadow copy ID
                                so the alias can then be used for scripting.

        Example: ADD VOLUME C: PROVIDER {b5946137-7b9f-4925-af80-51abd60b20d5} ALIAS systemVolume