Downtime, period when a service is unavailable, Workaround, temporary method during an interruption, Notification, message that informs people, Critical application, system supporting essential work, Maintenance window, planned period for technical work, Affected systems, services impacted by downtime, Recovery time, time needed to restore normal operation, Business continuity, ability to keep essential operations running, Contingency planning, preparing alternative procedures, Restoration, returning a service to normal

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