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/20110107050214/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/ttl
TTL (Time to Live) is used to describe when a ping is sent to a computer which is then sent to a different computer, like a server. TTL is equal to the number of hops the ping travels to before it returns an attempt failed message.