on bes 4.1.x just install BES on a 2nd server. Don't let any of the BES services start. Use the same SRP.
Using either SQL Backup or some sort of backup application, make sure your BES DB is backed up and copied to the DR BES server.
When you need to fail over to the DR BES, stop the backup job, make sure your production bES is off, and then turn on the DR BES. Magically everything continues to work!
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