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/20110106214209/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/analog
Humans see everything in analog and all our senses are tuned in to it as our daily lives are a constant stream of analog data. In digital terms analog is estimated in ones and zeros.