You can't directly use the scadaBR data base with Mango Automation but you should be able to export as JSON and then import into Mango. You will probably see some errors but you can correct those with find and replace on the JSON based on what the error tells you.
If you want to save your history data mango Automation enterprise which includes the NoSQL database has a feature to migrate historical data from older version of Mango which should also work for scadaBR.
You can see this link for more information: http://infiniteautomation.com/wiki/doku.php?id=system_admin:database_conversion
Also to clarify, Mango Automation does still support Derby databases we just don't use that as the default setting or recommend that it is used. You can use Mango to convert from a Derby database to H2 or MySQL.