(20)To ensure business continuity in times of disruption, the secondary processing site of the CCP should be located sufficiently distant and in a sufficiently geographically distinct location from the primary site so that it would not be subject to the same disaster which may cause the unavailability of the primary site. Scenarios should be created to analyse the impact of crisis events on critical services, including scenarios which envisage the unavailability of systems caused by a natural disaster. Those analyses should be reviewed periodically.