Shared Worlds Save file location/ Reverting Autosaves on Shared Worlds

[WoodenJoe]

How do you revert shared worlds autosaves? 

A strange thing happened where we were building in our base and for some reason a wall decided it was no longer supported and broke along with all of our chests. We recovered most of it in the little bags left from the chests, but the non-renewable stuff like the all of the Marble Shards and stuff are just gone. I'm the owner of the shared world, but my friend was hosting it at the time. Playing on PC through Steam.

Already tried making a standard copy and seeing if it would expand to show auto saves, but it does not.