Adding a directory to CUA already in EA pair

I have a customer looking to add another share to their existing CUA setup with a unique retention period to their Enhanced Availability environment.

Without EA, I see that I must create the new directory under gateway_cifs, set the data retention, and modify the smb.conf to allow their specified group to that share.  I haven't figure out what the required changes to the smb.conf file will need to be though.

What I need to figure out is how the configuration gets to the standby CUA.  Is the configuration copied to the standby when it is initialized, similarly configured, or updated periodically.

Chuck