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zipfile?unzip -l backup.zipsay?-Ioption is invalid on my Linux. What is your distro, and what does the man page say it does? Mine has a-ioption which "emits mime-strings rather than human-readable ones". I suspect your file is a .zip, but you suppressed that information. If the contents of your folder were already compressed (e.g. images) then zip will not achieve significant reductions, so 50GB would be understandable.