Several times Igor Pavlov commented that the lrzip/rzip approach is interesting but had he no time to investigate so far it seems. :) Like: http://sourceforge.net/p/sevenzip/discussion/45797/thread/f07ca6a4?limit=25&... http://sourceforge.net/p/p7zip/discussion/383043/thread/a058cd58#bfe0/eb06
Nemo