[seewhat]

I've recently installed RCS on a Windows host for versioning my .emacs file, and I rely on Emacs VC to drive the tool.

On Solaris hosts, including locked-down "production", I use SCCS to version my dot-files because it's available by default. For development I use SVN (old too by today's standards).

I don't advocate using these old tools over modern alternatives; however I find their simplicity in the above cases to be beneficial.