What I mean by permanence is that you can’t delete. Databases typically allow delete and mod and this is a big problem for me.

What is a more accurate term? I always used persist for writing to disk, like databases do.

With the “workaround” you describe, although a big pain in the ass for lots of nodes, still doesn’t work. How do you know that someone’s backup is correct? Or how do you verify that a remote node didn’t write/delete/sync? There’s many situations that make your idea fail that a blockchain would work.

Although, I agree that lots of “blockchain” solutions just need a decent distributed cache since you don’t care much about integrity.