We all define disasters differently. Some companies view it on a scale of disruptions in case of accidental or malicious data loss or damage, some companies view it as disruptions due to power loss or other natural calamities, some companies view it on equipment and systems failures, while some companies view it as nothing, wherein, they ignore these disruption causes because they feel they do not need it or their business are indestructible.
No matter how we view disasters, we all know that today, we need a strategy that provides protection, fast recovery and high availability of these systems so as it will create minimal or no effect on the entire business process as a whole.
Basic backup does not cut it nor address it. You need effective ways on how to keep your employees working, continue communications, and maintain business as usual during disasters.
This area of IT and/or business should be closely looked upon.