How to copy all Virtual Servers to another Server in cluster

Ubuntu:
20.04:
Dear Team,

I’m running virtualmin and configured the DNS Slave server as well and its working fine from last 8 months. I want to configure the secondary server as my full slave server and want to automate all the copying of my virtualservers to the other slave server.

Could you please direct me to some document or guide so I could get what I need to get.

Thanks.

Ali.

deleted - reread question

Anybody could help me please … ?