The interface of the program will guide you through the process in a really easy way. You can even plan backups for a certain hour and days. By this way, you'll be safe without any worries.
If you want to double-check if everything is perfect, you'll be able to restart the system and boot from the backup within 2 minutes.
Casper is an excellent tool for users that take care of their data. Having a backup is always welcome, so we recommend you this application.