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I doubt that the different schemes would make a lot of difference to be honest since the compression algorithms typically only look forward a limited amount in order to control memory use. The exception is S3 which would end up larger most likely since compressing a compressed file adds overheads but cannot compress. If you want better compression, look ...


7z a D:\HTM\comp.7z D:\HTM\*.htm You don't need the -o since you're creating an archive. You also fail to specify which files need to be included in the archive (D:\HTM\*.htm). The output is the complete name of the archive (D:\HTM\comp.7z). The quotes aren't needed here, since there are no spaces in the filename(s).


So convert from ImageMagick will produce rasterized PDF and many people would be interested in keeping vector graphic and text untouched so only embedded images are compressed. So good alternative to making compression is using gs from package ghostscript example of usage: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET ...


You can add -k option to your command line: -k --DOS-names Attempt to convert the names and paths to conform to MSDOS, store only the MSDOS attribute (just the user write attribute from Unix), and mark the entry as made under MSDOS (even though it was not); for compatibility with PKUNZIP under MSDOS which cannot handle certain names such as ...


A rar file has Recovery Records, so in case of damaged files parts of it can be recovered. When you create a rar, you can specify an amount of correction data in percent to be used. I found that on the German Wikipedia only (https://de.wikipedia.org/wiki/RAR_%28Dateiformat%29#Recovery_Records), the English version lacks this.

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