John,
I can tell you this BackupExec Server software, Exchange Agent, SQL Agent, and Remote agent License keys need to be installed on the BackupExec Server or the server that has a tape drive. If you are going to remotely backup SQL or Exchange
Servers over the wire then you will need to install SQL Management tools and Exchange System Manager on the BACKUP SERVER as well and install SQL and Exchange service packs that you are running on your Exchange and SQL servers. The Service packs only update the management tools that are installed. Then from the Backup server you push out/install the remote agent to your Exchange or SQL servers. If your SQL or Exchange Server are on the Backup Server then you do not need to install the SQL and Exchange tools because they are already installed.
Tony