-> Azure SQL Managed instance has in-built database backups called Automated backups. It is not required for users to schedule regular backups manually. Refer this article for more details.
-> Performing a manual database backup sometime becomes mandatory in Managed instance.
-> Lets first create a storage account so that we can perform a manual backup of a database in Managed instance.
-> Create a storage account using above details. Once storage account is created, add a container into that storage account.
-> Backup database from SQL Server management studio using below method,
-> Signin to the azure portal.
-> Click “OK” after the credentials are created.
-> Script out the backup script by clicking on Script and selecting “Script Action to New Query Window”.
-> Notice “COPY_ONLY” included in the script. Lets try removing COPY_ONLY and try a backup. it fails with below error,
Msg 41904, Level 16, State 1, Line 3
BACKUP DATABASE failed. SQL Database Managed Instance supports only COPY_ONLY full database backups which are initiated by user.
-> Error message clearly advises us to take a backup with COPY_ONLY option. Lets try performing the backup with COPY_ONLY and it fails with below error this time,
Msg 41922, Level 16, State 1, Line 3
The backup operation for a database with service-managed transparent data encryption is not supported on SQL Database Managed Instance.
Msg 3013, Level 16, State 1, Line 3
BACKUP DATABASE is terminating abnormally.
-> This error is related to Transparent Data Encryption (TDE) that is enabled by default in Managed instance using Service-Managed key. TDE with Service-Managed key does not allow copy-only backups. Lets configure TDE to use a Customer-Managed key and then perform a backup.
PLEASE NOTE – I am performing this task on a TEST subscription with no active application connecting to the database. If you are planning this on a Production database, you need to plan and test things well in advance and then perform it on a production instance, as this will have major impact while implementation.
-> I will use Customer-Managed key and place the key in an Azure key vault,
-> Create the Azure key vault using above details.
-> Click “Save” and you are ready to go.
-> Lets try performing a backup with COPY_ONLY option on the database in Managed instance. This time it works fine.
-> We are able to see the file in the storage account also.
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