Google Sites – How to Export and Import Entire Sites

There's some step-by-step instructions here;

http://www.backupify.com/personal/tour

1. Click manage next to the service you would like to setup.
2. Authorise account
3. View archives and export

Hope this helps.

You can share maps from your old account to your new account by using the Collaboration feature. I don't believe it's possible to share all of them at once; you'd have to do them individually.

Go to Google Maps, and click on "My places" on the left sidebar. Find the map you want to move over. Click on it, then click the "collaborate" link. From there, invite yourself as the collaborator, then send the invitation. You'll then be able to access the map from your new account.