How to back up blog

Oct 13 at 12:22 PM
I want to transfer my posts to another instance to another. I have a SQL based blog on 3.3 and want to move it to my other sql instance running the latest from github, but I don't see a backup button. I thought this backed up using blogML?
Oct 18 at 11:54 AM
No one knows? There used to be a back up button.