Videos are big. I have a YouTube channel and don't back my videos up. Quite the opposite, I regularly delete them to free up harddisk space. I do cross post them to lbry.tv though which I've found a lot better than peertube.

First time I've heard of lbry.tv - just curious, what's the main attraction for you?

Features and monetization. Peer tube instances had serious upload limits, and it’s been a while since I looked but there were some major missing features like descriptions or editing or something. I actually really like pornhub’s monetization options but there is no audience there for the videos I make. Lbry struck a balance between features and not a porn site.

I make computer security videos so there is a non negligible chance my YouTube will get deleted.

I think they are as close to uncensorable as you can get. See https://lbry.tech