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Risto_Saarelma comments on What I've learned from Less Wrong - Less Wrong
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It seems relevant to the comment that "if memory is reversible, it's not memory". Reversible computers have reversible memory.
Reversible computer designs people actually consider building do a small bit of irreversible computation copying end results of the reversible computations into irreversible memory before rolling back the reversible computation. Perfectly reversible computations are a bit useless since they erase their results when they start rolling backwards.
You can erase some of their results without erasing others, of course.
Nobody says you have to run a reversible computer backwards.
A big part of the point is to digitise heat sinks and power management. For details about that, see here.