mirror site
US /ˈmɪr.ər saɪt/
UK /ˈmɪr.ər saɪt/

1.
site espelho, site duplicado
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
:
•
The popular software download site maintains several mirror sites to handle high traffic.
O popular site de download de software mantém vários sites espelho para lidar com alto tráfego.
•
If the main server goes down, users can still access the content through a mirror site.
Se o servidor principal cair, os usuários ainda podem acessar o conteúdo através de um site espelho.