Agreed, VMS filesystem was the first thing that came to mind for me as well. Seems rather sad that in 2012 we don't have that as a standard feature like we did back then.

For the record, you don't have to be all that old to have used VMS's filesystem :-)

Chill out. I'm old enough to have used ITS, which introduced versioning(†).

(† Apparently: http://en.wikipedia.org/wiki/Versioning_file_system)

My company still uses VMS specifically for the versioned filesystem.

We just retired our old vax a couple of years ago :>