[Samba] convert from synology

[Peter Carlson]

I am getting ready to convert from Synology AD (smbd V 4.4.16) to an 
ubuntu server running 4.15.9.  the basic steps I see are :

1. join samba as a DC verify that everything gets replicated

2. rsync sysvol from the synology to new server

3. transfer FSMO roles

4. change samba's DNS backend to BIND  (I need the server to respond for 
multiple domains)

Just curious of any gotchas or steps I might be overlooking. Does there 
happen to be a guide on doing something like this?

Peter