Data you don't have in at least two places, is data you don't want. This applies to logical places on the internet too. Of course, you don't need to keep a co

Data you don't have in at least two places, is data you don't want. This applies to logical places on the internet too. Of course, you don't need to keep a copy of everything you see on the internet. But if you have a dependency you might want a copy. wget was the thing back then, maybe something similar with youtube-dl now?