Wow this is so awesome!

How/where does the data get saved for later? I'm guessing from the example, you don't need a database? E.g. I can just save the data to a document database, and next time someone works on it, just sync with the database? Or do I not need it at all because it's stored on the browser? And how would the information be associated with accounts, if someone wanted that feature?

Also curious how/where the demo site is deployed (guessing Vercel doesn't work since they don't seem to support websockets? I see that Hocuspocus is mentioned — is that required as a backend to make it all work?

Sorry I'm new to all of this and it sounds like magic, but I'd LOVE to learn how to implement this; especially on something like Vercel, if possible