Comprehensive Overview of Disaster Recovery (Disaster Backup) Technologies and Practices
This article provides a detailed introduction to disaster recovery, covering backup concepts, continuous data protection, high‑availability and disaster‑recovery architectures, key metrics such as RTO and RPO, and the three levels of disaster‑recovery solutions from data to business continuity.
The latest "China Disaster‑Recovery Industry White Paper" serves as a foundational guide, presenting comprehensive concepts, terminology, regulations, technical principles, industry trends, market characteristics, and solution overviews to promote broader understanding of the evolving disaster‑recovery field.
Chapter 1: Introduces disaster‑recovery knowledge and technical overview, defining disaster‑recovery, its grades, and specific technologies such as replication, archiving, switchover, and deduplication.
Chapter 2: Details compliance requirements, including international and national standards and certifications.
Chapter 3: Discusses disaster‑recovery implementation and services, covering construction content, disaster‑recovery drills, and service quality evaluation.
Chapter 4: Explores cloud migration and cloud disaster‑recovery, outlining migration steps, development history, and implementation considerations.
Chapter 5: Highlights disaster‑recovery characteristics and solutions for specific industries.
Chapter 6: Analyzes industry trends, market size, and future directions.
Backup is defined as copying data or systems to other storage media to prevent loss from errors or failures. Backup types include scheduled vs. real‑time, and full, incremental, and differential backups, illustrated in the accompanying diagram.
Continuous Data Protection (CDP) offers near‑real‑time backup, enabling second‑level granularity. CDP variants (True CDP vs. Near CDP) differ in data‑restore granularity; True CDP provides uninterrupted monitoring and point‑in‑time recovery, while Near CDP may involve slight delays.
Backup methods also vary by server state (cold vs. hot) and storage location (local vs. remote). Hot backup transmission modes are shown in the diagram.
High‑availability (HA) systems use active‑standby or active‑active configurations to ensure continuous service, while disaster‑recovery (DR) focuses on rebuilding services in a remote site after a major failure.
Key disaster‑recovery metrics include RTO (Recovery Time Objective) and RPO (Recovery Point Objective), with additional indicators such as DOO (Degraded Operation Objective), NRO (Network Recovery Objective), and APIT (Any‑Point‑In‑Time rollback).
Disaster‑recovery solutions are categorized into three levels: data‑level (basic backup and restore), application‑level (application functionality takeover), and business‑level (comprehensive continuity covering IT and non‑IT aspects, often requiring minute‑level RTO).
Download link for the full white paper: https://pan.baidu.com/s/1stel0vcoBkUsnxeS1yzGEQ (extraction code: 1208).
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