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A mirror site (also called a mirrored site) is

[a] proxy server acting as a cache containing duplicated data from a central database so as to facilitate more economic and reliable access by local users.[1]


A mirror site

is usually created by a system operator because the content it holds is very popular and it is accessed very frequently by a large number of users. In such a case, the user accessing the data may or may not know whether he is accessing the original site or the mirrored site. The updating of the mirrored site may happen automatically every time the original site is updated, or it may be done manually by the system operator of the mirror.[2]

Mirror sites divert some of the traffic from the original site. It is not unusual to find a dozen or more mirror sites of busy ftp sites.

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