You should be locally saving any video you ever think you will want to watch again. Many of the videos I enjoyed in college of regular people just making stuff for fun (when being a content creator wasn't a thing) have been taken out by reruns of copyright searching bots and creators turning 30 and being embarrassed by what they posted in their 20s. One musical artist I followed decided to take down all of their old content because their latest album wasn't getting enough plays.

I save everything with replay value now, especially music.

THIS!

If music, video or writing is something you want to see again, download a copy to own it yourself. Trusting a for-profit streaming company is simply idiotic.

HD space is cheap these days, so no excuses.