System Logon Account Password

I am running Backup Exec 2014 with all of the patches.

My "System Logon Account" is DOMAIN\sbe.  What is the proper way to change the password for this account?  

In AD first and then in Backup Exec via the Logon Account Managment tool?  Or do I just do it in the Logon Account Managment Tool and that passed it to AD in the background?

Thanks for any help with this process!

-Chris