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/20110106181146/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/macos
Mac OS is the operating system for Macintosh computers and it has been in existence for a number of years now (since 1984). It has been updated several times and there are newer versions in existence.