Despite all the precautions we covered in the security module, there may come a day when your site either gets hacked, or deleted or corruptedin some way. In this case you must have a backup of your site to restore from.
This video shows the different options you have for backup and how to do them:
You may need to right-click the following links and select Save Target As/Save Link As to download the file to your computer
The plugin I recommend for full site backups is BackupBuddy