What's the archive & install option good for if you can't really re-use it according to this apple site: http://docs.info.apple.com/article.html?artnum=107120
"You cannot start up your computer using a Previous System folder, nor can you "re-bless" the Previous System folder."
"You cannot start up your computer using a Previous System folder, nor can you "re-bless" the Previous System folder."