this is self-hosting local-first apps. There's some local-first manifesto somewhere... one of their greatest 'backend' developments were CRDTs. The idea, is that the app can be turned off, synchronization can be interrupted and resumed, and so on. Those CRDTs allow people to use a text editor even when the client(s) are disconnected from the server. Of course, depending on how much your version differs, the merge conflict of diverging versions will be easier to solve...