I was searching for an equivalent of git-archive for creating a bit identical version of the tar.gz each time I run it. I couldn't find anything like that and svn export .. && tar cvfz .. will result in different hash sums for different people/time it gets started. This has different reasons:

There are different ways to generate mirrors of subversion repositories like svnadmin dump, svnadmin hotcopy or svk but you need more privileges to do it or will not create a "perfect" copy. Since subversion 1.4 exists a new alternative svnsync. It is really easy to create a private mirror with only some steps (you should check user in pre-revprop-change before make it public accessible).