Definition of cloud computing disaster recovery and backup

Disaster preparedness refers to the use of existing scientific and technological means and methods, in advance, to establish a reliable emergency response to deal with the occurrence of emergencies .

Disaster recovery includes disaster recovery systems and backup systems.

1.2.1 Backup

Backup: To ensure the security of data, backup refers to the process of saving all or part of the data set from the production host hard disk or array to other storage media.

1.2.2 Disaster Tolerance

Disaster Tolerance: To ensure business continuity, disaster tolerance refers to the establishment of two or more sets of the same in a distant location, including the complete infrastructure (computing, networking, storage, power cooling, etc.) of the IT system, through the network to achieve the transfer of data, when the main data center fails, the use of the backup data center can be used to quickly restore business.

1.2.3 Difference between the two

Protection object : Backup protects data, disaster recovery protects business continuity.

Method of realization: Backup is realized using backup software technology, while disaster recovery is realized through replication or mirroring software.

Time cycle: The data protection cycle is not consistent, replication or mirroring time cycle is shorter.

Supplementary: archiving uses backups.

1.2.4 Relationship between the two

Backups only : If there are only backups, the business can not be recovered quickly, data recovery takes time, and this time brings immeasurable losses to some industries. In addition, backups are generally performed periodically, and in the event of data loss, the data between the time of the recovery resumption and the time of the last backup will be lost.

Only disaster recovery: If there is only disaster recovery, the business can be quickly recovered and the data can be protected, but if there is a faulty operation in the production section, or if the system upgrade fails, it will be synchronized to the disaster recovery side, which will cause the business to be interrupted.