You might enjoy reading through the original Google FS papers. I forget what they’re called but it addresses the durability problems.

Ah, I couldn’t remember the name because it’s literally named Google File System. https://static.googleusercontent.com/media/research.google.c...

I seem to remember bigtable also being interesting.

More than that, you might enjoy MIT’s distributed systems course. It’s all freely available online. I went through it for fun a decade ago or so, and it’s worthwhile for reasoning through hard problems like this.

People have definitely (ab)used YouTube as a filesystem though. And that’s probably your best bet for durability and performance.