I was just listening to a YouTube playlist of mine that goes back at least 10 years and was disappointed how much of it was deleted. And not only that, but in many cases I couldn't even tell what the videos were.
Literally just today, I picked one music video that just seemed to be gone from youtube and the internet, but thankfully was able to find a Wayback machine link to the artists website in 2008 with a .mov download link.