mirror site
US /ˈmɪr.ər saɪt/
UK /ˈmɪr.ər saɪt/
1.
a copy of a website on a different server, used to reduce network traffic or provide alternative access in case the main site is unavailable
:
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The popular software download site maintains several mirror sites to handle high traffic.
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If the main server goes down, users can still access the content through a mirror site.