What is the purpose of a back-up power source on the launcher?

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Back-up power is about redundancy to keep critical systems running even if the main power source fails. On a launcher, you need power for the control electronics, safety interlocks, arming/disarming and safe-state logic, guidance and sensor systems, and communication links. If the primary power drops out or is degraded, the back-up power ensures these safety-critical functions stay active, allowing for safe operation, fault handling, and an orderly response rather than a complete shutdown of essential capabilities.

The other options don’t fit this purpose. Powering entertainment systems is nonessential and would waste limited resources. Operating underwater isn’t a feature of how a launcher is designed to operate. Doubling thrust isn’t accomplished through a back-up power source and isn’t related to preserving safety-critical functions.