What do you mean by fortune telling that you have a backer behind you?

What do you mean, someone is behind you?

There is a backer behind. There is someone behind you, which means that someone behind you has been protecting you, and there is a backer behind you, so you won't get hurt. For example, if you have a good family relationship, your parents will always be your children's backers. If the child is tired and needs comfort, he can go home to find his parents.