dns cluster force sync

hi guys, i have a cluster of 4 dns-only servers, connected to another 3 cpanel webservers. i would like to sync the servers completely between them, like all zones to be exact on all servers. i have server1 which should be replicated to all. is there any whm functionality or cli to do so? or i just have to archive /var/named and copy it manually to all servers? thanks.