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by yegle 1631 days ago
iOS backup apparently doesn't work like you described. E.g., when restoring a backup from iOS 14, it doesn't revert your system to iOS 14. Clearly there's a separation of restoring the executables and restoring the configs.

I do expect "the config/setup that would trigger a battery drain in <iOS X" to be restored, but Apple can always fix iOS so that the same config/setup won't break >=iOS X.