technology which consists in maintaining an exact copy of all data from the source primary storage or a destination storage volume. We distinguish between synchronous and asynchronous technologies, the latter does not wait for the validation of the last write before sending new data. Only the last version of the data is restorable from the target storage pool, this technology is known as Single Point In Time.
(aka. Physical Library) backup device comprising an arm, a set of locations and having at least one physical drive for data storage. Modern libraries include locations called "mailboxes" to facilitate tape vaulting. The arm of the library is controlled by the backup server which controls the movement of tapes during the backup, archiving, duplication or restoration processes.
backup device based on a disk array dedicated for storing backed-up data. The libraries can be VLS (Virtual Library System) type or VTL (Virtual Tape Library).
