Hello,
In order to backup the remote SQL server,all you need is the SQL agent which includes the remote agent. You can install the SQL agent on the present Backup exec server and the remote agent on the SQL server. You will thus be able to backup the SQL server and would not need any additional program for that.
However, while backing up, the device needs to be connected to the backup exec server.
For additional information, you can refer to the Administrator's manual for 9.1 which you can download at the following link:
http://support.veritas.com/docs/266190
Hope this helps, do intimate us accordingly. In case you have further queries regarding this issue, you can write back to the forum. In case we do not receive your intimation within two business days, this post would be assumed answered and archived.
Regards.