Backups and Disaster Recovery

The 3-2-1 rule, RPO and RTO, and the one practice that matters most: actually testing the restore before the disaster forces you to.

1. Backup vs Disaster Recovery The two different problems hiding under one word, and the 3-2-1 rule that makes a backup trustworthy.
2. RPO, RTO, and the Cost Dial How much data you can lose and how long you can be down, and how those two numbers set your backup budget.
3. The Untested Backup, and Ransomware Why the restore drill is the only proof that counts, and the offline, immutable copy that survives an attacker.