Enable versioning for Documents and Files modules
I know, the first thing you are going to say is, "just use a VCS  repository and hook it into redmine". My use-case for this request is for users of Redmine who are not going to be able to deal with the complexity of a VCS system. I'd like to be able to use a simple web-based file system, like the one currently built into redmine, with a couple of additions. The system doesn't need all the complexities that a full-on VCS requires. Simply keeping a copy of each "upload" of a document/file around and possibly a simple lock/unlock sytem would be amazingly useful. And, hopefully, not overly complex to build.
Another solution, although more complex, is to offer some basic integration with the VCS, via the Repository tab. When you click on an individual file, include a link to "upload" (checkin, commit, whatever) a new version of that file. This, i'd imagine, would be more difficult and fraught with unknowns then including a simple (like, really simple) versioning tool for the builtin documents/files modules.
 Version Control System