Is it common to say something important as "backbone"?

Native speaker’s answer
Rebecca
Yes, it's fairly common. "Backbone" refers to the structure of something, the base that holds everything together or the part of something that makes it successful. Ex: A good education is the backbone of success. Ex: Donations are the backbone of thrift stores. Ex: You don't have a backbone. => this means that you can't stand up for yourself or say your opinions