There were versioning file systems in the 1960s (MIT's ITS among them, and I think Univac's EXEC 8, though I can't find a reference) [1]. Often, new writes to a

There were versioning file systems in the 1960s (MIT's ITS among them, and I think Univac's EXEC 8, though I can't find a reference) [1]. Often, new writes to a file bumped a version (or cycle) count in the file system. I don't know, but I wouldn't be surprised if there were tools to do diffing and patching much like modern VCS systems. [1] https://en.wikipedia.org/wiki/Versioning_file_system https://en.wikipedia.org/wiki/Versioning_file_system