SQL Server Data Folder

If you chose to install SQL Server Express during the installation of Flow then it will have created a data folder where the database files reside.

The Flow installer lets you enter the path where SQL Server Data Folder will be located. By default it prompts you with C:\ which means the data folder would be created as C:\MSSQL.1\

You should store database backups within the sub folder c:\MSSQL.1\MSSQL\Backup\.

You should create or restore databases to the sub folder c:\MSSQL.1\MSSQL\Data\.