Disaster recovery methods

Data-level disaster recovery

Data-level disaster recovery focuses on data, that is, after a disaster occurs, the user's original data will not be lost or damaged.

Data-level disaster tolerance is relatively basic. Among them, the low-level data Disaster Tolerance solution only requires the use of tape libraries and management software to achieve remote data backup and achieve disaster tolerance; the Advanced Data Disaster Recovery Solution relies on data replication tools, such as volume replication software or storage system hardware controllers, to achieve Remote Data replication.

Data-level disaster tolerance is the bottom line to ensure data availability. when data is lost, the application system can obtain all data again. In this sense, data backup belongs to this level of Disaster Tolerance. Users store important data on tapes. If advanced security is taken into account, they can transport the tapes to a remote location for storage, when a disaster occurs, the data is obtained from the tape.

This level of disaster recovery takes a long time, and there are still risks. Although the original user data is not lost, the application will be interrupted and the user's business will be forced to stop. This solution is cost-effective and easy to build.

Application Level 

For enterprises with a large number of business applications and the system needs to run continuously for 7 × 24 hours, it is clear that high-level application disaster recovery systems are needed to meet their needs.

Application-level disaster tolerance is based on data-level disaster tolerance, and then copies the application processing capability. That is to say, an application system is also built on the backup site. The application-level disaster tolerance system can provide uninterrupted application services, so that the service requests of your applications can continue to run transparently without the possibility of a disaster, ensures the integrity, reliability, and security of the services provided by the Information System.

Generally, application-level disaster recovery systems need to be implemented through more software. This allows enterprises to quickly switch various applications in the event of a disaster to ensure business continuity.

Business level 

Data-level disaster recovery and application-level disaster recovery are built by users within the IT scope. However, for normal businesses, IT system alone is not enough. Users need to build the highest level of business-level disaster tolerance.
Most of business-level disaster recovery is non-IT systems, such as telephones and office locations. In the event of a major disaster, users' original office space will be damaged. In addition to the original data and original application systems, more importantly, the staff should be able to perform business normally in a backup workplace.

Disaster recovery methods