The youtube downloader tool, and its better fork yt-dlp, can archive almost any video link you throw at it. Every time I find a video that I think is useful, it gets archived using this tool. Twitter, reddit, youtube, bitchute, doesn't matter.

You'll also want ffmpeg, just download the 'essentials' zip file. Place the yt-dlp and ffmpeg executables in the same folder, and open a command prompt in that location. Then just use

yt-dlp.exe <paste in url of video>

It will download the highest available quality of that video and audio, and stich them together into one file with ffmpeg.

I used this to archive all those zoom clips of that pedophile professor talking about how hes not sure that sex with a one year old is bad because there is no proof it harms the child.