Disaster recovery is the process by which an organization anticipates and addresses
technology-related disasters. IT systems in any company can go down unexpectedly due to unforeseen circumstances,
such as power outages, natural events, or security issues. Disaster recovery includes a company's procedures and
policies to recover quickly from such events.Amazon Web Services (AWS) lets you set up disaster recovery,
both for on-premise services, and for workloads deployed in the Amazon cloud.
AWS offers four main disaster recovery (DR) strategies you can leverage to create backups and replicas that are
available during disaster events.Each strategy has progressively higher cost and complexity, but lower recovery times:
Backup and restore – involves backing up your systems and restoring them from backup in case of disaster.
Pilot light – involves running core services in standby mode, and triggering additional services as needed in case of disaster.
Warm standby – involves running a full backup system in standby mode, with live data replicated from the production environment.
Multi-site active/active – running a full, secondary production system, ready to serve traffic when needed.