Backup Exec 2014

I have installed Backup Exec 2014 V-ray edition and deployed agent on most of computer. I have one old SQL server that has Backup Exec 2008 running. I want to backup Backup folder on the D drive of SQL server using Backup Exec 2014 without interrupting existing backup and  without replacing old agent on that server. I just need to backup folder on secondary drive without replacing agent but Backup Exec shows erorr that it already has exisiting agent and needs to be replaced which I do not wish to change.