Many companies idea of a disaster plan is to make it after the disaster.
You have to build it in. That takes time money and training. Do you do failovers? Do they work? What is your backup situation? What is your list of work items to do during the failover? How long does it take? Do you even HAVE a failover plan? Can your services handle being in 'split brain'? Do you have specialty services that can only run in one place?
The unfortunate reality is this planning happens many times too late.
You have to build it in. That takes time money and training. Do you do failovers? Do they work? What is your backup situation? What is your list of work items to do during the failover? How long does it take? Do you even HAVE a failover plan? Can your services handle being in 'split brain'? Do you have specialty services that can only run in one place?
The unfortunate reality is this planning happens many times too late.