- What is the difference between RTO and RPO?
- RTO (Recovery Time Objective) is how quickly you must restore service after a failure. RPO (Recovery Point Objective) is how much data loss is acceptable — essentially, how old the last backup can be. Both are defined by business requirements, not technology.
- How often should backups be tested?
- At minimum quarterly for critical systems, and every backup cycle for automated systems. Untested backups fail in real disasters far more often than expected — one study found 30% of restore attempts fail on first try.
- What is the difference between backup and replication?
- Backups are point-in-time snapshots stored separately and protected from ransomware/deletion. Replication copies data in near-real-time to another system but also replicates corruption or deletions. Both are necessary for comprehensive disaster recovery.