Backup, Recovery, and Disaster Recovery Questions
Protecting data and ensuring recoverability: backup strategies and schedules, restore testing, RPO/RTO objectives, disaster-recovery planning, and failover. Covers designing backup and recovery that actually restores under pressure, and building DR that meets the business's tolerance for data loss and downtime. Resilience against data loss and site failure.
List the primary factors that influence a backup retention policy including compliance, business requirements, storage cost, restore frequency, and legal hold. Provide a concrete example retention policy suitable for a finance application requiring seven years of records and explain how lifecycle transitions could be implemented.
System design task: You manage a small web application with three web servers behind a load balancer, a PostgreSQL database, and a 500 GB NFS file share containing user uploads. Business requires RTO <= 4 hours and RPO <= 1 hour. Propose a backup and recovery architecture (backup types, schedules, retention, storage targets, and test plans) that meets the requirements and minimizes cost.
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