# Disaster Recovery Specification

## Overview

Disaster recovery procedures and backup strategies.

## Backup Strategies

### Database Backups

**Full Backups**: Daily full database dumps
**Incremental Backups**: Continuous WAL archiving (PostgreSQL)
**Storage**: Off-site backup storage
**Retention**: 30 days full, 7 days incremental

### Application Backups

**Configuration**: Backup configuration files
**Secrets**: Secure backup of secrets
**Code**: Version control (Git)

## Recovery Procedures

### Recovery Scenarios

**1. Database Corruption**:
- Restore from latest backup
- Replay WAL logs
- Verify data integrity

**2. Service Failure**:
- Restart services
- Verify health
- Check logs

**3. Data Center Failure**:
- Failover to secondary region
- Restore from backups
- Verify functionality

### Recovery Testing

**Frequency**: Quarterly
**Tests**: Restore from backups, verify data integrity

## RTO/RPO Targets

**RTO (Recovery Time Objective)**: 1 hour
**RPO (Recovery Point Objective)**: 5 minutes (max data loss)

## Multi-Region Failover

### Failover Strategy

**Primary Region**: Active services
**Secondary Region**: Standby/replica services
**Failover**: Automatic or manual failover

### Data Replication

**Method**: Database replication, data synchronization
**Latency**: Acceptable replication lag
**Consistency**: Eventual consistency acceptable

## References

- Infrastructure: See `infrastructure.md`
- Scaling: See `scaling.md`