Hi Tony, Tks for your advice. > I would guess you would want to use tar's --listed-incremental > feature, but > you'll have to start over. "info tar". Summing up your advice as well as other info on Internet searched previously I think "tar" won't be the compressing tool for my application. What I need are; 1) create a new compressed tarball in a faster way starting on the old compressed tarball instead of starting over. 2) remove subdirs and files on the old compressed tarball which have been deleted 3) add new subdirs and files on the new compressed tarball etc. What will be the right tool for me? Any suggestion? TIA B.R. SL