- The duplication of stored data at a remote location, on another drive, another medium, or the like. Used, for instance, for backing-up, disaster recovery, or as a security measure. Also called mirroring (2).
- The maintaining of identical copies of data and files at multiple network sites or servers. For example, an entity which receives many download requests from around the world may have many diversely located mirror sites to facilitate access. Also called mirroring (3).