/Provider=ProviderNameOrID /For=ForVolumeSpec /On=OnVolumeSpec /MaxSize=MaxSizeSpec - Adds a shadow copy storage association ...

%1 %2 [/Provider=ProviderNameOrID] /For=ForVolumeSpec       /On=OnVolumeSpec [/MaxSize=MaxSizeSpec]      - Adds a shadow copy storage association between the volume specified by       ForVolumeSpec and the volume specified by OnVolumeSpec the shadow copy       storage volume.  Storage for shadow copies of ForVolumeSpec will be       stored on OnVolumeSpec.  The maximum space the association may occupy on       the shadow copy storage volume is MaxSizeSpec.  If MaxSizeSpec is not       specified, there is no limit to the amount of space that may be used.  If       the maximum number of shadow copy storage associations have already been       made, an error is given.  MaxSizeSpec must be 1MB or greater and accepts       the following suffixes: KB, MB, GB, TB, PB and EB.  Also, B, K, M, G, T,      P, and E are acceptable suffixes.  If a suffix is not supplied,       MaxSizeSpec is in bytes.  If the provider is the supplied Microsoft       provider, MaxSizeSpec must be 100MB or greater.      - The provider ID can be obtained by using the List Providers command       When entering a Provider ID, it must be in the following format:         {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}       where the X's are hexadecimal characters.        Example Usage: vssadmin Add ShadowStorage                               /Provider={b5946137-7b9f-4925-af80-51abd60b20d5}                              /For=C: /On=D: /MaxSize=150MB