The space requirements can be very low capturing something like writing code, where only 1% of the screen might change second-to-second.

"ffmpeg -f gdigrab -i desktop -c:v libx264 -preset medium -fps_mode vfr -crf 0 -an -vf mpdecimate capture.ts" (Windows, -f x11grab -i $DISPLAY for Linux on X11) produces a lossless video that averages 102 MiB/hour for me (1920x1080 @ <= 60fps). That's about two cents a day at current disk prices, and easy to upload as a private YouTube video if you don't want to lug the files around.

If you don't like the CPU hit, use -preset ultrafast to record the capture using less processing power but giving a larger file, and then re-encode that file later using -preset slower. There's no quality loss if you used lossless mode (-crf 0), and for content like this the savings are especially large (reducing to around one-quarter ultrafast size, in my experience).

Wow, I did not know that. Awesome!