If you feel like chatting with others who also archive YouTube content, consider stopping by my discord server: https://discord.gg/xjj538vD
We maintain a central list [1] of content that various members have archived, such that when content is removed from YouTube, people can direct inquiries to contributors who have archived that content.
It's a small way to keep track of what things have been successfully archived, and occasionally direct efforts to preserve specific content.