Starting with [[Mac OS X Lion|Lion]] (10.7), [[macOS]] has a feature called [[Os_x_lionMac OS X Lion#New_or_changed_featuresNew or changed features|Versions]] which allows [[Time Machine (Apple softwaremacOS)|Time Machine]]-like saving and browsing of past versions of documents for applications written to use Versions. This functionality, however, takes place at the application layer, not the filesystem layer;<ref>{{cite web|title=Mac OS X Lion file versions, part 2|url=http://tekonomist.wordpress.com/2011/08/06/mac-os-x-lion-file-versions-part-2/|accessdate=28 April 2012}}</ref> Lion and later releases do not incorporate a true versioning file system.
