How to know the problem when i make this Full Backup Scenario?

i'm working new on database administrator and i have some questions if i want to make SQL full backup database every Saturday at 6:00 AM and for some reasons the device was shutdown the questions are : whats the issues for my backup ? is it rollback ? how can i know that was happened , when its not the time of work ? what the a good plan to be sure to take the backup every week with out problems