In the Microsoft SQL Server Management Studio, open the Object Explorer and then:
Right-click on Management > Maintenance Plans
Click on New Maintenance Plan...
Give a name to your plan
Create as many sub-plans as you need for your strategy
Select a sub-plan and drag and drop the appropriate tasks from the Toolbox panel
To back up a database, the appropriate task is Back Up Database Task
For the configuration of the backup schedule, you simply have to follow the wizard and define what you need.
If you want more information, I recommend you go on the official website of Microsoft: Create a Full Database Backup.
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