BACKUP / REPLICATION
In order to understand the terms of backup and replication, it is firstly required to deal with the terms of Disaster Recovery and Business Continuity.
Disaster Recovery (DR) is the process of re-starting your workplace after the case of corruption. It can include a natural disaster such as an earthquake or hurricane or be caused by a reason a la infrastructure failure due to a cyber-attack.
Business Continuity (BC) explains the processes and procedures determined by the organization to maintain significant functions of business processes during and after a disaster. The goal is to prevent interruption of critical services and re-commission all functions as fast and seamless as possible.
Backup includes generating a copy or copies of the production data. Backup procedure requires disc or cassette based solutions and require a venue to store archived cassettes.
The sole purpose of having a backup copy is compliance and detailed recovery requirements such as recovery of data of a user from three years ago. In principle, this concept is based on the snapshot technology where copies of data sets are taken in a determined period and stored regularly. Old backups are sometimes replaced with new ones and each backup cluster is considered as a different entity.
Hence, the goal is to operate with zero loss of production data against threats such as cyber-attacks, data thefts and natural disaster. Yet taking backup copies is not the only step to ensure business continuity.
Replication is the action of copying data to a remote device or platform. Therefore, replication requires investing in a device or identical infrastructure which may double IT infrastructure costs. It is generally scaled by Recovery Time Objective (RTO) and Recovery Point Objective (RPO). The gain tried to be obtained via replication focuses on business continuity ensuring fast and easy re-commissioning of operations following a disaster and similar scenarios.