Google doesn’t allow you to export your sites, so that would be a big no.

You will have to redo your site, if you want to host it else where.

You can’t export your site but what you can do is use Google apps for your domain with your new domain name, this gives you access to email on your domain, Google page creater(you can create pages for your domain) and gTalk

I use this on my domains and it’s a great tool. I mainly just use it for the email though, GMail s faster and better than the email I already get with my web hosting.

you cant do it because first you most give an addondomain from google and next you most change dns in your domain to google.