I’d like to use
http://www.visualsvn.com/server/
which installs simply on windows. But I’d like to know if I could copy it if needed on a linux server with apache subversion server installed. How can I be sure that the versions of format are the same ?
As djechelon says, VisualSVN just uses the standard SVN protocol; you can dump your repos via the Windows command prompt – the following will dump your whole repo and all revisions: