For me, having a backup plan means when 10-15 years on into the startup career and the tenth startup doesn't work out and shuts it's doors, I have a foundation

For me, having a backup plan means when 10-15 years on into the startup career and the tenth startup doesn't work out and shuts it's doors, I have a foundation in place that means I'm not starting from ground zero or hoping that the next startup is a lottery ticket that pays off. Also, the backup plans I envision involve more than one person and I realize that working with your partner isn't an option for everyone.