Is it necessary to Update Admin password every time when we change AD Server admin password?

Hi

My question is that We regurarly change the Admin password of Active Directory after 4 months , so after changing the admin password, we have to update  the Netbackup Client Service admin service , also DLO admin Service 

So my question do we have to change every time the admin priviliges of Netbackup Client Service And Netbackup DLO Service whenever we will change the admin priviliges of AD or that Particular server where master server is installed?

Windows 2003 server 32 bit

NB 7.5.0.4

Lotus Domino and SQL  Netbackup Client is running