Backup data center

Current setup:1 Domino application / mail server

1 Domino smtp / web server

We want to have a similiar setup at one of our remote offices for use as a backup should our primary goes down. My thinking is to have one Domino server with all the above services that is clustered with the primary application / mail server for quicker replication. DNS should failover to the secondary smtp if the primary in unavailable, and cluster services should re-route the Notes clients for email and applications.

Does this sound reasonable?