A business continuity plan (BCP) documents how an organisation will keep operating, or restore operations quickly, during a disruption such as a cyber attack, power cut, internet outage, equipment failure or natural disaster.
It identifies the critical systems and processes, the people responsible, the acceptable downtime for each and the steps to follow. It usually covers backups, alternative ways to take payments, contact lists and communication to staff and customers.
For a retailer this might include an offline mode for the POS, a mobile-data failover for the internet and a way to accept cards if the main terminal is down. Hospitality venues plan for kitchen and ordering systems too.
A plan only works if it is tested and kept up to date. Run a drill, check that backups can actually be restored and review it whenever systems or staff change.