I have a hierarchy of folders which contain lots of duplicates files (it's a series of versions of a LaTeX document, and while the evolved a lot, many of the figures are identical in multiple versions).

I tried to compress it with Maverick's native “Compress” right-clink menu item, but it doesn't seem to take advantage of the duplication (it leads to 15% compression, though I have at least 30% duplicated files in size).

So I'd wondering: are there common compression formats which would be good enough to take advantage of duplicated files? What app should I use for compression in that particular case?

2 Answers 2


I use 7zip to handle this and encodings issue. I use it from macrpots/command line, but there're many GUI versions

  • As I understand it, 7zip is a tool that supports multiple compression formats. What format do you use, that can handle duplicate file detection?
    – F'x
    Oct 28, 2013 at 9:58
  • I use 7zip format with best compression.
    – Eir Nym
    Oct 28, 2013 at 10:27

7-zip supports the 'WIM' file format which will detect and 'compress' duplicates. If you're using the 7-zip GUI then you simply select the 'wim' file format.

Only if you're using command line 7-zip, see this answer. https://serverfault.com/questions/483586/backup-files-with-many-duplicated-files

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