Earlier quoted context omitted.
It is already persisting and syncing data (fully encrypted) between the cloud and other users. You can think of Jazz as a distributed database itself. The coming-soon badges are about interop with traditional systems and higher level features we will add later. The fundamentals are solved and you can build full multiplayer, local-first apps with it. Does that make sense?
Does it store data persistently anywhere (on servers?). If so where?
Free tier is 1GB of storage, and it goes up from there.