Data mirroring is a method of data protection. Mirroring involves the simultaneous, complete , real-time duplication offiles and programs on two hard disks that are spatially separated from each other.
Mirroring is an online fault-tolerant backup. The data for mirroring can be copied on the fly using Instant Copy or Snapshot and stored in RAID systems such as RAID 1. For security reasons, the data is stored in different locations. With mirroring, data is stored and updated simultaneously on all storage media involved in the mirroring. Various network operating systems support the mirroring of hard disks.