Graduated/terminated vtubers in need of public archives:
>Yumeno Lilith
>Kusunoki Sio (channel still up)
>Yamiyono Moruru
>Oga Saki
>Lia Mitsurugi (and basically all of Wactor)
>Fuura Yuri
>Riifu Evergreen

Popular archive list:
https://rentry.org/vodarchives

Tools:
https://archive.ragtag.moe/ - re-hosting site
https://github.com/Kethsar/ytarchive - downloads livestreams
https://github.com/yt-dlp/yt-dlp - downloads videos and vods
https://github.com/aria2/aria2 - can download entire channels
https://chrome.google.com/webstore/detail/twitter-media-downloader/cblpjenafgeohmnjknfhpdbdljfkndig?hl=en - Twitter Media Downloader (Chrome)
https://addons.mozilla.org/en-US/firefox/addon/tw-media-downloader/ - Twitter Media Downloader (Firefox)

Archiving guide:
https://docs.google.com/document/u/2/d/1MR48duo8FmpUIVGPvDRzBd3y5HnalrF1wmiS9fO99N4/

Previous thread: >>48326320