@ian As far as I can tell it’s all done using the normal local files. I enabled it on my existing vault a few months ago and everything stayed in place. I occasionally view & edit notes outside of Obsidian and it still syncs fine.
@ian Yes. I use obsidian sync and also access the files directly with no problem. I like Sync by the way, way better than setting up my own thing with syncthing
@ian particularly on Android. Getting it working reasonably on my Chromebook was the last straw. Much easier choice now that they dropped the price, too.