smwoodcrafts,
We use domino agents to backup our domino servers. The two ways that I know of that you can check is by either connecting to the server itself and check to see if the CA Arcserve Domino Agent is installed on the server, or, when you look at the backup job, you can see it has a funky name that it is backing up. For example, my backup job states:
dbanotes@DOMINO_SERVERNAME
But, when I actually browse the files in ArcServe that are getting backed up, none of the ".nsf" files are physically checked. Instead, when you browse to the server running Domino, you can see a little Database icon followed by the string I wrote above. When you expand that item, you can see all of the Domino databases.