Keep in mind these builds are for testing purposes only and can cause much troubles, so DON'T use if stability is important for you.
The backup feature of the svn installer is rewritten, too. It should also work with Vista machines, now. But please backup you installation directory, the config files and databases by hand before using the installer.
Like always testing is much apreciated, bug reports and improvement suggestions are welcome, but don't moan if it is not working 100%, yet. ;)
Thanks & regards