Total videos downloaded: 131539 (approx since January 2021)
Still online: 106633
Unavailable (Deleted/Unlisted): 24906
Of those one huge channel with 6000 videos over the past 12 years was recently deleted. Still, a seemingly safe gaming channel has had about a dozen videos either privated/unlisted or deleted (some due to newly added age verification hits)
I do not wish to disclose the exact channels/videos, these videos will soon end up on archive_dot_org. Though it's a warning to you: add all your subbed and favorite channels to a daily youtube-dl (yt-dlp) download.
If you subbed to too many channels to create a list manually: create a Google Takeout for the youtube profile you're using, set the smallest archive size. The first archive will contain a CSV with subscriptions.
EDIT, Sep 27th: To be completely honest, I should add that I specifically archived some political channels that were at risk. In that sense, my high percentage of vanished videos is a good KPI of my archival choices.
[deleted]
always save what you love, especially music i would have downloaded and put it on my phone/ipod
Here's a channel that might fill a similar niche.
https://www.youtube.com/channel/UCa3SDs8cPme7tD9S8BIVYrw/playlists
Has Skyrim music, Oblivion music and some playlists for WoW, Overwatch and The Witcher
Can confirm, there is this one mix on YouTube which I like to hear in the morning before taking to the skies, at some point it was gone. It was on and off for a few months, but I was lucky and managed to get a copy at some point.
I've been getting into synthwave remixes of modern pop music, thank god I've been downloading the ones I like because some have already disappeared.