Yes, the RA is required on the BE media server. When you install the BE, the RA is automatically installed though. For other servers you want to backup, the RA needs to be installed on each of them too. See this link, http://support.veritas.com/docs/237500 , for more related info. As for other ones you mentioned (Exchange, SharePoint, SQL, and many more), you need to pay for the options, which there are a quite few depending on your needs.