I do not know much about Radicle but it fits with what I'm talking about.

My explanation here comes without ever using git, so bear with me.

When you use the command line to command git to interact with some remote storage, you're calling on software programmed to look for a centralized server you point it at, like Microsoft servers in github's case.

In my world, when you call on git in your command line to read or write data remotely, your "git" command calls on software programmed to connect to a p2p network like Radicle you just mentioned. Radicle seems like it might be a "decentralized backend" I'm talking about.