[Question]Archived Pages on Wayback Machine.

How do you get wayback machine to crawl and archive website pages so often?

I was checking a website and noticed that wayback machine has been crawling and archiving its pages daily. Checking randomly, the content seemed to be the same and no changes were done. Why do they get crawled so often?
I know that you can submit pages to archive dot org manually and trigger a crawl but it is very time consuming and I doubt that website had their pages crawled this way.
So how do they do it?