Seting up failover server - copying domain to another server

Hi, we have a server that used Webmin/Virtualmin and want to setup domains on another server for failover. We have rsync setup to backup the /home directories, but how do we set up the domains. As part of setting up rsync we have created the users.

So if we simply setup the domains in the normal and the /home directories and users already exist will it work or is there a way of exporting/importing a domain or another way of doing this.