Maybe you're thinking something with couchdb and pouchdb, where the client can replicate to and from a cloud/hosted db and be able to work offline - in theory.

Maybe you're thinking something with couchdb and pouchdb, where the client can replicate to and from a cloud/hosted db and be able to work offline - in theory. It's very specific to that db combo though, very few, if any, apps use them as primary data store (afaik).