The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Web wide crawl with initial seedlist and crawler configuration from October 2010
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110106203531/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/mirror
A Mirror is a computer term that means an FTP or Web server that has the same files on it as another server. They are used to provide an access point when the main server is overrun with requests.