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I did my own benchmark on 1.1GB Linux installation vmdk image: rar =260MB comp= 85s decomp= 5s 7z(p7z)=269MB comp= 98s decomp=15s tar.xz =288MB comp=400s decomp=30s tar.bz2=382MB comp= 91s decomp=70s tar.gz =421MB comp=181s decomp= 5s all compression levels on max, CPU Intel I7 3740QM, Memory 32GB 1600, source and destination on RAM ...


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You must be combining the -z and -j compression options. The first uses gzip the second uses bzip. The command tar xjvf will not give you that error.


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The reason that alle.tar works in addition to alle.tar.gz is due to web server features such as Apache Content Negotiation, as you can see by the examples on the page: Filename Valid hyperlink Invalid hyperlink foo.html.en foo - foo.html foo.en.html foo foo.html foo.html.en.gz ...



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