Actually there are two ways to save the posting. First by using draft.blogger.com and second, by using email. Both take place automatically, but the specific storage using the email need a little extra effort ...
* Sign in to blogger
* On the Dashboard page, click Settings
* Click the email link
* BlogSend box appears. Enter your email address
* Save Changes
* Sign in to blogger
* On the Dashboard page, click Settings
* Click the email link
* BlogSend box appears. Enter your email address
* Save Changes