In day to day conversation, I frequently use the word "backup" to refer to a dependable but perhaps slightly less desirable option. For example,
When applying to college, you should apply to 10 dream schools and 10 backup schools
I know this is not your first choice, but it is a good backup.
How can I translate the word "backup" used in this context?
Someone once told me that 保底 has this meaning. Is that correct?