Unable tro backup exchange 2000

[bharat_4]

Iam using HP OmnibackII 3.5, how do i go about backing up my exchange server 2000. everytime i try to backup it throws an error saying that "unable to backup, either you are not connected to the server or the service you are trying to backup is not running" my exchange services are started as its a live mail server, i even tried stopping the services but still the same error.
can someone help me on this???

Thanks

Bharat