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/20101206213324/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/petabyte
A Petabyte is a unit of storage that is only used in reference to a number of hard drives or other data collections. It is expressed as 2 to the 50th power, or 1,125,899,906,842,624 bytes.