[HughParry]

Depending on what you're looking for, this is the kind of thing that P2P protocols were made for.

Check out https://syncthing.net/

[logicprog]

Syncthing actually doesn't provide a way to view your files online, you have to set up an instance on your local computer then have the files synced to there and then view them locally. However, on the forums I have found links to something that people seem to recommend for viewing files online, a sort of enhanced web index: https://github.com/lrsjng/h5ai.