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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
mirror
mirroring
1. Writing duplicate data to more than one
device (usually two hard disks), in order to protect against
loss of data in the event of device failure. This technique
may be implemented in either hardware (sharing a {disk
controller} and cables) or in software. It is a common
feature of RAID systems.
Several operating systems support software disk mirroring or
disk-duplexing, e.g. Novell NetWare.
See also Redundant Array of Independent Disks.
Interestingly, when this technique is used with {magnetic
tape} storage systems, it is usually called "twinning".
A less expensive alternative, which only limits the amount of
data loss, is to make regular backups from a single disk to
magnetic tape.
2. mirror site.
(1998-06-11)