We have already replied to your query on the below thread. Adding as @cdinet mentioned in the below thread, there is one more way to perform this. Take a EPO Snapshot/DB backup and restore it on DC environment, create a DNS entry to redirect the Agent communication. So in short, every time you have to perform this steps whenever the active server goes down and you have to regularly take backups. Again it is kinda tedious job and not feasible as well.
Why don't you try ePO clustered service...? You need to reach out to professional service to customize your environment.
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