I was gonna suggest the AT&T Tech YouTube channel, but I forgot it got bogged with these Threat Traq videos (they aint the worst, but wish they did it as another channel), and now you cant search YouTube in reverse chronological order anymore. but at least you can still search "archives".
https://www.youtube.com/user/ATTTechChannel/search?query=arc...
Edit: Periscope Films another good Youtube channel for older educational films, im sure most of yall know but if not