make a backup for azure database
Any idea how to download the database in ".bak" format?
SQL Azure doesn't provide a native way to generate '.bak' format backup file. If you did need this format file, you could import the BACPAC File to your local SQL Server to create a new User Database. Then you could generate a '.bak' format file from your local SQL Server.
In addition, you also could try a tool named SqlAzureBakMaker which could make '.bak' file for you easily.