Need some information about Tem 8.2 infrastructure

Hello Team,

I am new to TEM and need following information about replication and DR.

  1. What is default replication policy between primary and secondary server. Where to edit those setting> please guide for configu.
    2)How to test DR for TEM server … example 1 primary and 1 secondary server 3 Relay for each root server. and around 3000 client …please guide for DR

3)How to import masthead file and how to upgrade masthead file version/