Disaster recovery best practice.

Hi all, 

I was just wondering in case of setting up a Disaster Recovery environment what are the best practices. 

What i think is that everything related to production : CM, CD, DB servers should be duplicated. One group, together with its load balancer, should be live delivering content while the second group together with its load balancer should be in a Cold Standby state. 

To start with, there is a PreProd environment from where the content is promoted to production using replication. Therefore, i believe, this replication mechanism should affect both live environment (normal live + cold stand by).

Am I right so far? If yes or even if no anyone is aware of which communication ports should be opened between db and servers ?

Thank you

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