There are many ways to do this. There are many contributing factors that would dictate what strategy is best for you.
Did the DR system get configured by the SAS Deployment Wizard or was it cloned from production?
Is the DR going to be up all the time?
The way I've tackled this is to use the SAS Platform Object frame work to periodically port content from one system to another.
Identities in both the DR and production come from the same upstream system (Active Directory).
See this link for the promotion tools.
https://go.documentation.sas.com/?docsetId=bisag&docsetTarget=n008xsxs34mvcwn1qrgcmugpzu6i.htm&docse...