A data storage technique optimizing space utilization by storing only one copy of identical data. Subsequent instances of the same data are replaced with a pointer or reference to the original copy. Consider, for example, multiple virtual machines on a server utilizing the same operating system files. Instead of each VM storing a complete copy, this technique ensures only one set of OS files exists, with the other VMs referencing this central instance.
This approach reduces storage capacity requirements, improves data management efficiency, and simplifies backup and recovery processes. Historically, it became significant as data volumes increased rapidly, necessitating more efficient storage solutions. Benefits include lower storage costs, faster data replication, and reduced network bandwidth consumption during backups.
