I searched for a solution to take a blog offline so I can archive them at the end of its life. The solution is http://www.blogbooker.com . To use it with blogger.com I had to export it through the onboard backup function to a xml. Only the xml isn't much help if you want to read it offline. Here blogbooker.com comes in the game. I had to upload this xml and tell it the public adress of the blog. Then I got a plain pdf with all pictures and comments. Videos can not be exportet into pdf of course.