What is the relationship between disaster recovery and backup?

Disaster tolerance refers to the uninterrupted operation of the business of the survival system in the event of human error, malicious attacks, natural disasters and other disasters, while ensuring that the data of the production system is lost as little as possible. Broadly speaking, any measure to improve system availability can be called disaster tolerance, which can be divided into local disaster tolerance, remote disaster tolerance and cloud disaster tolerance. A disaster recovery system can be realized by different technologies, and the division of disaster recovery system is determined by its final effect.

Backup refers to the backup of data or system, which is the basis of disaster tolerance. It refers to the process of copying all or part of data sets from the hard disk or array of the application host to other storage media in order to prevent data loss caused by the above disasters.

Secondly, the purpose of the two is not the same. Backup is the process of transferring online data to offline data. The purpose of backup is mainly to deal with data security issues, such as data loss or logical errors in system data.

The purpose of disaster recovery construction is not to protect data, but to ensure continuity and online business. In other words, when there is any fault in the production system, the disaster recovery system can quickly take over the business, so that the production business will not stop and the loss will be minimized.