The Wayback Machine is a database that contains replicas of more than 286 billion Internet pages, created in 2001 by the Internet Archive. The digital archive created by Brewster Kahle allows you to view websites that are temporarily unavailable, closed, or removed, as well as to view a web page over time.
The Wayback Machine works in a simple way: just type in the address (URL) of a web page to see which is the last copy saved in the Wayback Machine. If we want to see what a page in question looked like some time ago, then the Wayback machine will ask us what date and year we want to visit the page. There is now a new bar at the top of the screen, which allows you to graphically see these moments over time. The length of the bars in the graph indicates in which months the most copies were made. What this site does to store all the content of the web page is very simple but ingenious: it stores all the html content of the source code and thus saves no the images but only the codes, so when an image server removes an image from the website we visit, it is not played, but is marked as a 404 error.
In 2006 it contained up to 2 petabytes of information and was growing at around 20 terabytes per month.