You can use this page to download a copy of the most current backup of the database for your site in SQB format.
Go to Administration > Web Admin > Download DB Backup.
Click the Download Backup button.
Downloaded DB backup files are encrypted using Transparent data encryption (TDE). After downloading a DB backup file, click the Download Certificate button to download the certificate, which is valid for one year after it is generated.
To restore a previous DB backup file, customers can now view and download previous certificates by clicking the List Certificates button and selecting a required certificate.
In your browser, download the SQL Backup to MTF Converter program here: http://www.red-gate.com/labs/free-tools/.
Use the program to decompress the file to a Microsoft SQL BAK file.