You can use the T-SQL BACKUP DATABASE statement to back up any SQL Server database.

This article shows you how to backup a database to disk. This creates a .bak file which can be used later to restore the database if required.
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While you can certainly rename a SQL Server database in the SSMS GUI by right-clicking on the database name and selecting Rename, sometimes you might prefer (or need) to do it using Transact-SQL.

The most basic way to rename a database using T-SQL is like this:

-- Change to the master database
USE master;

-- Change the database name
ALTER DATABASE Films  
Modify Name = Movies; 
GO

The only problem with this basic script is that it doesn’t change the name of the data files and log files. In most cases you’ll probably want to change the names of these files to match the new name. In that case you can take the following script and replace the database name with your own (as well as its file names and paths):
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Any time you create a database in SQL Server, two files are created. One is the data file, and the other is the transaction log file.

The location of these files will depend on whether or not you explicitly specify a location for these files when you create the database. If not, they will be created in the default location.

You can find the default location with the following code:

SELECT
  SERVERPROPERTY('InstanceDefaultDataPath') AS 'Data Files',
  SERVERPROPERTY('InstanceDefaultLogPath') AS 'Log Files'

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If you ever need to know where your database files are located, run the following T-SQL code:

USE master;
SELECT 
  name 'Logical Name', 
  physical_name 'File Location'
FROM sys.master_files;

This will return a list of all data files and log files for the SQL Server instance.

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