I have a perl script that I threw together a while ago that will create a tree of symlinks in artist/album/song format which point to the data fids, extracting the info not from the mp3 tags but from the index fids. This in conjuction with wget or rsync or whatever will give you a mirror of your empeg on a unix machine. It could be adapted for windows use I suppose.

I will attach it in case anyone wants it, but I don't have time to clean it up or document it, so it's probably the case that if you couldn't write it yourself anyway it's not going to be very useful. It probably has bugs in it.