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...ion and rsync pieces of the problem will be far from optimal. Another way of putting this: If I say that there isn't a good deal of improvement in compression ratio for compression block sizes above 4000 bytes, then I would optimally choose my checksum algorithm and parameters so that 4000 = (Xavg - Xsigma). If I have a small Xsigma, that allows me to have a smaller Xavg. And smaller Xavg *should* translate into better rsync performance. I have NOT tested this yet, but it is certainly an obvious next step. There is one more consideration: If a small change is made to a file, what are...