Reaper already does this with the audio files and it's separate from auto backup (which backs up the project file). When recording, every buffer-full (block) of audio data written to the hard drive includes an End Of File mark. That means if the power suddenly cuts off, the recording is intact right up to the cut point and the file is valid with an EOF mark. The header of the wav files will not include a valid length but Reaper lets you load the files and reads them correctly anyway and you can render to as new file.
Auto backup pertains to the project file (.rpp). You can set the preference to auto save during recording if you wish.
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