Try AutoVer It (possibly abandoned) is free and works great for me. I install backup files every time I click save with a minimum interval of 1 minute. Then you can move files through it. You can back up to ftp and even have a command after the backup so that you can integrate with command line tools like diff. I also found a page with an opening panel for Eloi , which aims to do something similar in appearance, but still in development.
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