Comprehensive Overview of Cloud Disaster Recovery and Backup Technologies

Cloud Disaster Recovery Classification and Definition

Cloud disaster recovery (DR) refers to the built‑in DR system of a cloud data center that ensures continuous service after a disaster, while cloud backup uses public‑cloud storage as the backup medium to protect production data.

Cloud DR Definition and Main Application Scenarios

Cloud DR provides cross‑availability‑zone active‑active and cross‑region redundancy, supports automatic virtual‑machine migration and load balancing on physical‑machine failure, and offers read‑only or active‑active database replicas across zones. It is mainly used in private‑cloud data centers of government, finance, public security, telecom, and other high‑availability industries.

Cloud Backup Definition and Main Application Scenarios

Cloud backup transfers data over WAN to remote data centers using standard protocols, offering service‑based, on‑demand, elastic, and secure storage. It supports various platforms (Windows, Linux) and databases (SQL Server, Oracle, MySQL, etc.) and is used for public‑cloud, hybrid‑cloud, and private‑cloud scenarios.

Reference Model and Key Technologies for Cloud DR

The cloud data center virtualizes all resources, pools them logically, and can span multiple sites, which simplifies sharing but adds complexity to backup and recovery. Key changes include protecting logical objects (VMs, virtual disks) instead of physical hardware, distributed tenant‑centric management, and supporting SaaS, PaaS, and IaaS services.

The recommended DR model deploys each Cloud OS component in both production and backup sites, with Keystone in active‑passive mode to handle authentication and real‑time data replication. When the primary site fails, the backup Keystone takes over.

Reference Model and Key Technologies for Cloud Backup

Cloud backup differs from traditional backup mainly in the backup medium, which is remote cloud storage. It offers incremental backup, deduplication, multi‑tenant management, and data‑trust assurance (encryption, compliance, audit).

Incremental backup improves efficiency for large data volumes.

Deduplication reduces storage consumption dramatically.

Multi‑tenant management enforces role‑based access control for different users and administrators.

Data‑trust technologies ensure secure transmission, storage, and meet regulatory compliance.