[Samba] Transfer file server to new DC

[Piers Kittel]

Hello all,

Have joined a new DC to an existing active directory consisting of a 
sole DC.  So, we now have two domain controllers, the original being 
ad.DOMAIN.intranet (192.168.0.17), and the new one being 
DOMAIN-ad.DOMAIN.intranet (192.168.0.11).  The old DC is also the file 
server - I'm aware this is strongly advised against.  I want the new DC 
to become the file server but can't find any instructions online on how 
to do this - is it just simply following 
https://wiki.samba.org/index.php/Samba_File_Serving for the new DC and 
reverse the instructions for the old DC, syncing everything up and sorted?

Servers are Debian 9 with 4.5.16-Debian, both are identical 
software-wise (but definitely not hardware-wise!)

Many thanks!