Yohoo!
Rsync's main benefit is on backups of changed files. dumping to a new destination every time makes rsync less efficient than just about every other option. Now if you made the new directory, and hardlinked the old stuff to the new directory, then rsync would shine.
That's what rsnapshot is designed for. It uses rsync to sync the files to a backup destination and hardlinks any existing file, so you can go back to any level you like.
Christian