I use a wiki which internally uses RCS, but you never see it. The only reason I even know is that I needed to scan older versions of some assets and it was straightforward compared to what you'd expect with Git. (Other bonus, attachments and meta pages are stored as actual files. With a little bit of code you can cobble together an automated page builder for e.g. physical assets.)
I consider rsync --link-dest a version control system.
I use a wiki which internally uses RCS, but you never see it. The only reason I even know is that I needed to scan older versions of some assets and it was straightforward compared to what you'd expect with Git. (Other bonus, attachments and meta pages are stored as actual files. With a little bit of code you can cobble together an automated page builder for e.g. physical assets.)
I consider rsync --link-dest a version control system.