The Collaborative International Dictionary of English v.0.48:
Mirror \Mir"ror\, v. t. [imp. & p. p. Mirrored; p. pr. & vb.
1. To reflect, as in a mirror.
2. To copy or duplicate; to mimic or imitate; as, the files
at Project Gutenberg were mirrored on several other ftp
sites around the world.
3. To have a close resemblance to; as, his opinions often
mirrored those of his wife.
Moby Thesaurus II by Grady Ward, 1.0:
54 Moby Thesaurus words for "mirroring":
companion, copy, copying, counterfeiting, dead ringer, double,
duplicate, effigy, emulation, exact likeness, fakery, fellow,
following, forgery, hit-off, icon, idol, image, imitation,
impersonation, imposture, impression, likeness, living image,
living picture, match, mate, mimesis, miniature, model,
onomatopoeia, parody, photograph, picture, plagiarism, plagiary,
portrait, reflection, repetition, resemblance, rubbing, semblance,
shadow, similitude, simulacrum, simulation, spit and image,
spitting image, takeoff, trace, tracing, twin, very image,
The Free On-line Dictionary of Computing (18 March 2015):
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
2. mirror site.