VMS did. It had a configurable (not sure if it was system wide, or user definable) number of versions it kept and it was simple to retrieve past versions (as l

VMS did. It had a configurable (not sure if it was system wide, or user definable) number of versions it kept and it was simple to retrieve past versions (as long as it was within the number of generations it kept). And since it was at the OS level, anywhere you could request a file, you could also specify the version. I don't know if the versions applied to directories though (I doubt it, but my exposure to VMS was quite brief).