There is a school of thought that says having a back-up plan is acknowledging that your original plan will not not succeed. The people who hold to this school of thought also believe that it’s that apparent lack of confidence that causes the ultimate failure of the plan.
Wow, I would have never thought that having a backup plan meant that I didn’t have faith in the original plan. Look at NASA, they have backup plans for everything, and those plans have backups. It’s called being prepared.