vssadmin list providers

Lists the volume shadow copy providers registered on the computer. A shadow copy provider is the component that creates and manages shadow copies (point-in-time snapshots) of a volume. A provider can be the built-in system provider that Windows includes, or a software or hardware provider that a storage vendor supplies. Run this command when you want to confirm which providers are available before you create a shadow copy, or to verify that a vendor-supplied provider is installed and registered correctly.

vssadmin list providers