Disaster recovery
RTO - Recovery Time Objective - is the time it takes after the disruption to restore a business process to its service level.
RPO - Recovery Point Objective - is the acceptable amount of data loss measured in time before the disaster occurs.
Disaster recovery strategies
Backup and restore - storing backup data on S3 and recover data quickly and reliably.
Pilot light - for quick recovery into AWS - quicker recovery times than backup and restore, because core pieces of the system are already running and are continually kept up-to-date
Warm standby - a scaled-down version of a fully functional environment is always running in the cloud.
Multi-site - run your infrastructure on another site, in an active-active configuration.
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