Google Cached Pages
Cached pages by google is among the most useful features of Google Web Search. If a website is down or is taking too much time to respond, or the webpage is removed by the owner you can quickly retrieve the cached copy of that page from Google servers.
Google makes web pages they have indexed available from their cache. Pages cached by Googleprovides a quicker display of the target page because you're getting it from Google's computer instead of from the Internet at large.
So why would you ever not use the Cached link instead of the main page title link? Mainly because the cached page is not necessarily up-the-minute, especially with pages that change frequently (such as Weblogs and news sites). If you view the cached version of a page that you know changes frequently and is dated, such as the front page of a newspaper site, you can see that Google's cache is a day or more behind. For users without high-speed Internet access, it's more convenient to pull from the cache when looking for a big page (about 50K or so) that doesn't change much.
Archive.org or Wayback Machine
How does Google looked like in 1998? The simple answer is The Internet archive or Wayback Machine.The Internet Archive is a non-profit group, based in San Francisco. Since 1996, they have been archiving cached pages of web sites onto their large cluster of Linux nodes. Unlike Google, they do not simply keep track of the current content on each site. Instead they revisit sites every few weeks or months and archive a new version if the content has changed. The intent is to capture and archive content that would otherwise be lost whenever a site is changed or closed down. Their grand vision is to archive the entire Internet. As of October 2014 they have more than 435 billion web pages from all kinds of sites.
