Step 1 - Set up a unix box.
Step 2 - Set up apache, webdav (apache module), SVN, Trac on your box.
Step 3 - Check everything out of OpenSVN
Step 4 - Check everything into your SVN.
I believe your versions will get reset to 1. I've never heard of OpenSVN but it looks just like what I set up at home and work.