It’s a matter of survival. All businesses, regardless of size, should have a disaster recovery plan. In the event of a disaster, a recovery plan is critical for getting the business back up and running as quickly and as cost-effectively as possible.

No single disaster recovery plan will fit all businesses. Consider the types of disasters most likely to occur and how they are best addressed. Remember, too, that the nature of a disaster will impact businesses differently. Before you can put a plan together, identify and prioritize the vital elements your business needs to continue operating after a disaster. 

For more information Disaster Recovery for businesses:
http://www.disaster-recovery-guide.com/
http://www.smallbusinessnotes.com/operating/leadership/disaster/resources.html
http://www.fema.gov/business/index.shtm