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The short answer is no, there’s no backup you carry—the Tesla already has a very energy dense battery, so anything with enough juice to move you any distance would just be...a big huge battery.
The longer answer is that while this might seem like a concern, I’ve never gotten close to actually having to worry about it. Especially if you’re home charging (yes, Clyde, I know not everyone can do that), the car has a full battery every morning, and it provides you with tons of tools to understand your energy usage.
That, coupled with the Supercharger network that’s basically all over the place now (at least on the coasts) means that the chance you’ll be stuck on the side of the road with a dead battery is pretty low. It’s thousands of percent more likely that what will stick you on the side of the road, in fact, is 19th century pneumatic technology, since like most cars these days they don’t come with spares.
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