我怎样才能让Subversion只保留最新版本的文件？

I have a large file in my repository that is not text-mergeable and that I do not need multiple-version control for (PPT for example). I would like to keep it on the repository for backup purposes and to share with multiple people, but I do not want the repository size to grow huge because it's keeping a duplicate copy of the file every time it changes. Is there a way to specify this behavior for a file in a Subversion repository?I have a large file in my repository that is no