Plan testing maintenance and updating
During your planning phases, it is critical that you consider what the potential threats may be and build your plan accordingly. For example, in a natural disaster such as a flood or tornado, your physical space might be destroyed. In a power outage, the damage may be minimal or non-existent, but you still have to account for the downtime.
This is where you establish who will be responsible for what in the event of a shutdown or disaster. Think about the talents of your staff and where they can best be used. Remember that in a physical disaster, some of your staff might be injured and might not be able to carry out their duties. So you may want to assign additional people to some of these roles.
Try to imagine all of the possible scenarios and plan for a way to continue to communicate if all of your landline communications devices are down. Cell Phones will still work as long as your service is not interrupted but make sure you keep your battery charged.
More info: How To Identify Unknown And Evasive Threats