You can move them to your own server (just like you can move them to R2). Not sure what you mean by "manage"... don't think there's anything you really need to do to manage anything.
You get 1,000,000 write operations per month for free (more or less people uploading attachments/avatars), and you get 10,000,000 read operations per month for free (for things like avatars and other public data), you can use edge caching... so a "read" is only counted when it's not already in the edge cache. Meaning you can end up doing billions of real-world reads per month for free if you do it properly.