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wiki/concepts/Disaster-Recovery.md
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---
title: "Disaster Recovery"
type: concept
tags: [infrastructure, resilience, backup]
last_updated: 2026-04-21
---
## Definition
Disaster Recovery（灾难恢复）是一套在灾难性事件后恢复 IT 系统和数据的策略与流程，确保业务连续性。
## Core Metrics
- **RTO（Recovery Time Objective）**：系统允许的最大停机时间
- **RPO（Recovery Point Objective）**：可接受的最大数据丢失量
## Key Components
- **备份策略**：定期创建加密备份，存储于 S3
- **恢复流程**：经过测试的恢复程序文档
- **自动化恢复**：通过脚本实现自动故障切换
## Implementation
The Agency 项目中的 [[Support Infrastructure Maintainer]] 实现：
- 自动化备份脚本（GPG 加密 + S3 上传）
- 30 天本地保留 + S3 生命周期管理
- Backup verification 和 Slack 通知
## Related Concepts
- [[Feature Flag（特性开关）]]：控制代码路径而不需要重新部署，实现秒级回滚
- [[ITSM（IT 服务管理）]]：从工单系统演进为战略推动者，实现运营卓越和风险缓解