Database Backup Strategy: The 3-2-1 Rule for 2026

Backups are useless without verification. The 3-2-1 rule is mechanical; the verification is the discipline.

Why 3-2-1 matters

One backup: single point of failure for the data.

Three backups across media + offsite: durable.

Four-component implementation

• 1. Logical dumps (pg_dump, mysqldump).
• 2. Physical snapshots (volume-level).
• 3. Continuous WAL/binlog archive.
• 4. Offsite copies (different region/cloud).

Verification cadence

Quarterly: full restore rehearsal in a separate environment.

The first real failure-day restore is always longer than expected; rehearse.

Restore-time SLO

Restore-time SLO: e.g., 4 hours for full DB; 30 min for point-in-time recovery.

Make it explicit; track it; alert on missing rehearsals.

Antipatterns

• Backup without restore test. Untested = nonexistent.
• One copy. Single-point.
• Same region as primary. Region outage = lost both.

What to do this week

Three moves. (1) Apply this pattern to your most-loaded table. (2) Measure query latency / write throughput before/after. (3) Document the win and the constraint so the next refactor inherits the knowledge.