I note that for local SQL Express and I believe enterprise SQL Server there is the additional option of creating a Backup in SQL Express. I also note that from my reading Baks are considered preferable to bacpac files because they have enforced ACID compliance and that for large databases that are constantly being used they are recommended to bacpac files. SQL Azure doesn’t allow BAK file backups through SSMS from what I can see so if this is an issue for you consider temporarily disconnecting front ends from the database while a bacpac is conducted. If you need a bak file for some reason you can attach locally to a SQL Server instance and from there take a bak file.
Something to be aware of..
See this link for further information
Blobeater blog post