1. Data-level disaster recovery backup is to establish a data backup system or disaster recovery system. Such as databases, files, etc. The commonly used method is data replication technology based on disk array. Manufacturers include EMC, HP and so on.
2. Application-level disaster recovery and establishment of application backup system. For example, a set of OA system is running, and then a set of OA system with the same operation is established remotely, which is application-level disaster tolerance. The key technology is to realize real-time data transmission and ensure consistency, integrity and availability. The common method is database replication. Manufacturers include ORACEL and Zhongke Yi Tong.
3, system-level disaster tolerance, and then establish a whole set of systems, including software and hardware, team. For example, the real-time backup of the vice president of the United States.