AppFS ( http://appfs.rkeene.org/ http://appfs.rkeene.org/ ) allows you to do all of those things, except does not involve sandboxing in anyway. Sandboxing is o

AppFS ( http://appfs.rkeene.org/ http://appfs.rkeene.org/ ) allows you to do all of those things, except does not involve sandboxing in anyway. Sandboxing is orthogonal to the issue of presenting the files on disk for the application. Something could do sandboxing on top of AppFS and gain all the deduplication and run-all-versions-all-the-time benefits of AppFS.