Practice…practice…practice… This cannot be stressed enough. A plan is only as good as it is when it is executed. Once your plan is complete, and even throughout the design process, it is crucial that it be tested thoroughly to ensure that, should it need to be executed for real, it will work.
Testing the businesses continuity and disaster recovery plans provides an excellent training vehicle for everyone in your company. People at all levels throughout the company need to know what to do in an emergency and be aware of the role they may play in the recovery process.
The last thing you want is for your first test to be when you have an actual outage. That would not be a good time to discover an oversight or a design or implementation flaw.
After the initial plan is complete and successfully tested, schedule quarterly or semi-annual tests to be sure changes to your business and your environment have not rendered part or all of the plan ineffective.
Continuous testing will help to ensure that any new personnel are up to date and knowledgeable on the disaster recovery procedures should they ever need to be put into practice.
If someone asks if you have a viable disaster recovery and business continuity plan, you will be able to affirm with the utmost confidence.