I have made mention of the Wayback Machine – https://archive.org/web/ a few times on my blog: https://upsdownsfamilyhistory.wordpress.com/category/history-2/wayback-machine/page/2/. You can learn more about it on Wikipedia – https://en.wikipedia.org/wiki/Wayback_Machine if you aren’t familiar with it. I wasn’t aware of the Wayback Machine when it first came out. It has over 347 billion pages saved. If a site doesn’t want their content saved to the Wayback Machine, they honor the request https://en.wikipedia.org/wiki/Wayback_Machine#Website_exclusion_policy. See the section underneath the above link for changes made later. It also doesn’t work well if you need to log into a site to access the content.
It appears small parts of my blog was saved three (3) times: https://web.archive.org/web/*/https://upsdownsfamilyhistory.wordpress.com/.
A downside to the site is the need to save each page of a site. If I wanted to save every blog post to the Wayback Machine, I would need to save over 1,150+ posts.
It’s a great way to track changes although that depends on how a site handles changes. Find-A-Grave updated its FAQs section a while back so it’s now useless to update it on the Wayback Machine.