Reference: (below mssqltips link gives clear information on backups)
One of your last lines of defense for just about any system is to have a backup in place in case there is a need to recover some or all of your data. This is also true for SQL Server.
In this tutorial we will discuss
selecting the correct recovery models
what backup options are available
how to create backups using T-SQL commands and SQL Server Management Studio
If you are new to SQL Server you should review each of these topics, so you are aware of the available options and what steps you will need to take in order to recover your data if ever there is the need.
You can either use the outline on the left or click on the arrows to the right or below to scroll through each of these topics.