Comment by toxicFork

This has been a dream of mine for so long, it is great to see excitement and serious thought for it.

One hack to give this a try would be to play around with integrating APIs for cloud storage to go through a local cache system first, then do async synchronisation on demand. (Collaboration is not really enabled here but the rest of the principles in https://www.inkandswitch.com/local-first.html#practitioners become trivial). Essentially firebase but with developer facing API bridges, for dropbox, drive, Amazon, ftp, whatever. The twist: you have more control of the data and it doesn't necessarily go up to Firebase backend, the devices could even do the backend computations async. Then you can build on top of any cloud storage platform, even decentralize things. It gets even more exciting to think of decentralization.

I would like to additionally emphasize on the case for data being on the cloud where it is not necessary to be there. Location history comes to mind. I want it to be local-first, local-only.