Have a back up data system. Back it up often, and take a duplicate offsite when you leave. Have a plan for all your facilities. If you have off-site warehousing or manufacturing operations, have a contingency plan in case they are damaged or your access is cut off. Have duplicates of archived data.
All businesses have important papers, such as articles of incorporation.
These could be lost in a disaster, or your access to them could be cut off. Use suppliers who have business continuity plans. Using suppliers with their own contingency plans makes you less vulnerable when disaster strikes. Have a supplier agreement for disruptions. Carry adequate insurance.