Netbackup agent on Exchange Server

Hi Team, 

Please help to clear my doubt -

To take exchange DB online backups, do I need to install any Netbackup exchange agent separately?

I have installed Netbackup client agent on exchange server but the exchange database installation/creation is not done yet. Would I be able to configure Exchange DB backup after its installation/creation?   As I have installed netbackup agent before DB creation so little confuse if netbackup agent will identify the exchange DB or not.

Netbackup version - 7.6.0.3