Mike Wolman wrote:

  if you were keeping track of the blocks which had changed
  then you do not need to generate this list and simply send over the
  changed blocks.

Unison keeps a list of files at each end and only exchanges block lists for
files that have changed.  I use it to sync 40GB (10K files) over a 1Mbps
link and it's very fast.  It also will do two-way sync.
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