CREATE DATABASE databasename;

SQL DROP DATABASE

The DROP DATABASE statement is used to drop an existing SQL database.

DROP DATABASE databasename;

SQL BACKUP DATABASE for SQL Server

The BACKUP DATABASE statement is used in SQL Server to create a full back up of an existing SQL database.

A differential back up only backs up the parts of the database that have changed since the last full database backup.

WITH DIFFERENTIAL

BACKUP DATABASE databasename  
TO DISK = 'filepath'  
WITH DIFFERENTIAL;


EXAMPLE WITHOUT DIFF

BACKUP DATABASE testDB  
TO DISK = 'D:\backups\testDB.bak';

EXAMPLE WITH

BACKUP DATABASE testDB  
TO DISK = 'D:\backups\testDB.bak'  
WITH DIFFERENTIAL;

DataBase and https://www.w3schools.com/sql/sql_quickref.asp