Allow retention of version history even after old versions are purged
I recognise that there are storage limitations meaning old versions cannot be retained forever. [Though I would like to be able to extend/control this - separate idea].
However, even after the older versions of a file are purged from the system, I would like to be able to retain all the metadata about old versions, so I can see when files were first edited and when/who did subsequent edits. This change log can be valuable to understand when specific things happened, and storage costs should be minimal.