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/20110106204811/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/database
A Database is a structured way of holding data, and this data is usually organised in rows and columns although some more modern databases can contain images and audio/video files.