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/20101206224018/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/cleanroom
A Clean Room is a room where highly sensitive equipment is produced in order for it to stay free from contamination. Microprocessors are made in clean rooms and the air in them is constantly filtered.