Start with the people who work in your firm. Remember too, they have personal lives that need attention. What is interesting to note is that most of these areas are software-related, that is, they may reside on the computer system. Backing up your data in a systematic manner will definitely help you rebuild quickly if your firm is affected. Data protection has already been discussed, but what about the computer systems.
Surge suppressors are the first line of defense.
All computer hardware, printers, copy machines, and fax machines should already be protected. Phone lines connected to either the computer modem or the fax machine should also have a surge suppressor. If you have time before an impending disaster, backup the systems. Then, power down, unplug both power and network cables. Make sure you have a map or labels for the cabling.