It seems to me you could get away with it being most of your redundancy, especially on systems that aren't mission critical. I mean, between CoW and the Merkle

It seems to me you could get away with it being most of your redundancy, especially on systems that aren't mission critical. I mean, between CoW and the Merkle Tree of checksums going on the machine would have to literally random walk into a hash collision for the data to be unrecoverable.