Backup is nice.
Mine has been an only car for a significant portion of its 5.5 years with me, though, took me across the country twice, no problem. The perks of starting with a very well cared for low-mileage one. ^_^
Now I have three roadworthy and insured vehicles. It's nice.
The problem now is "which one do I drive?"
Single white middle class male American problems.