/Provider=ProviderNameOrId /For=ForVolumeSpec|/On=OnVolumeSpec - Displays all shadow copy storage associations on the system ...

%1 %2 [/Provider=ProviderNameOrId] [/For=ForVolumeSpec|/On=OnVolumeSpec]     - Displays all shadow copy storage associations on the system for a      given provider.  Not all providers use  shadow storage.  You will      receive an error if it is not supported by your provider.  To list all      associations for a given volume, specify a ForVolumeSpec and no /On      option.  To list all associations on a given volume, specify a      OnVolumeSpec and no /For option.     - 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 List ShadowStorage                              /Provider={b5946137-7b9f-4925-af80-51abd60b20d5}                             /On=C: