![]() ![]() Even if the local backup is damaged, the cloud copy remains intact.Īs for the third copy, the need for two different types of media is no longer widely recognised. Additionally, the cloud inherently satisfies the offsite requirement of the 3-2-1 backup policy, providing protection in the event of local disasters such as fires or floods. This immutability feature acts as a safeguard against hackers destroying backups. Many cloud storage providers now offer “immutable” storage, ensuring that data is locked and cannot be altered or deleted. In such cases, the backup copy stored in the cloud becomes crucial. However, a challenge arises if the local backup has been destroyed by hackers. The same applies to restoring from backups, as retrieving from a local copy is consistently faster. Due to the cloud’s limited bandwidth, backups are initially directed to a local storage appliance, which generally offers faster speeds compared to backing up directly to the cloud. Nowadays, most organisations adopt a hybrid approach. The cloud has emerged as a popular destination for storing backups, prompting many companies to reassess the traditional 3-2-1 policy. However, with the advent of cloud technology, there has been a significant shift in backup storage practices. Duplicating the backup files across two corporate data centres was the most common method for creating an offsite copy. Immutability was commonly achieved by physically storing the tape in a cardboard box or rendering the tape cartridge un-writable by breaking a plastic tab. Over the past two decades or so, the typical interpretation of “two diverse media” in the 3-2-1 backup policy involved storing one copy on traditional hard disks and the other copy on tape. Ideally, the backup should also be immutable, meaning it remains unalterable, undeletable, and undecryptable within a designated timeframe. This method involves generating three copies of data, utilising two different storage mediums, and ensuring that at least one backup is stored offsite. For decades, the 3-2-1 backup policy has served as the established benchmark for guaranteeing backup security.
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