You can SHA-256 hash an 80 gigabyte file.
There is no backdoor.
The data is lost.
You can't reverse engineer a couple of characters back into an 80 gig file.
It's pretty well documented that SHA-256 does not have backdoors and is often cited as the reason why people thought Satoshi worked for the NSA at one point.
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I can't, but I have no confidence the NSA can't. There's all sorts of mathematical tricks smart, sneaky people have come up with. You are aware, of course, that translating Satoshi Nakamoto means 'central intelligence', so I don't need to point that out. Anyway, I don't trust anything from known liars, and I know the NSA are pathological liars.
'Nuff said.