Re: Interesting dilemma
Hmm. I suppose you might weakly encrypt it (so that, if required, you could brute-force decrypt after some non-trivial but still feasible amount of cpu-weeks effort), and throw away the key. Then you could recover if absolutely necessary, but would not bother without some pressing legal reason; and after some appropriate n-year delay just delete it.
But this is probably a terrible idea. Feel free to tell me why :-)