There are different backup data methods: unstructured, system imaging, incremental, reverse incremental, near CDP (continuous data protection), and differential.Īn unstructured repository can be a stack of DVD-Rs or external hard drives (HDDs) with minimal information about what was backed up and when. The 3-2-1 rule states that there should be at least three copies of data stored on two different storage media types plus one copy kept off-site like in cloud storage. More complex options include a computerized index, catalog, and/or a relational database. Other data storage devices can also be arranged differently to provide geographic dispersion, data security, and portability.Īn information repository can be as simple as a list of backup media files and the dates they were produced. Since data storage requirements can be large, an information repository model can provide structure to this storage. Still, not all backup systems can reconstitute a complete computer system and other complex configurations like a computer cluster, active directory, or database server. Backups are a simple form of disaster recovery.
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