You can back up and restore configuration profilea easily:
Under profile menu select your profile (I have _DB.001) and press button “backup without logs”.
Then set up another machine, go to web interfac, select partition (sdax?) and press button “restore profile”
After profile is restored and machine restarted, just change the needed settings.
About LDAP I dont know, I have disabled it. Just using ZS as VPN router.
I have DNS server on internal network and have configured Zeroshell to use forwarder.