site-migration-toolkit/docs/EN/BackUP/postgresql_disaster_recovery.md

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# Unified DB Backup & DR Plan
This document is based on the actual deployment of the `install.svc.plus` production environment. It outlines the standard operating procedures for the global PostgreSQL database backup, restoration, and Disaster Recovery (DR).
## 1. Production Database Architecture Checklist
Based on the production environment reconnaissance, there are currently **three independently running PostgreSQL instances**. When performing unified backups, data must be exported from these three instances separately.
| Instance Purpose | Runtime Mode | Listen Port/Address | Contained Business Databases |
| :