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I downloaded a cPanel full backup from my shared host (backup-4.23.2019_20-34-30_username.tar.gz). The original file size is 3 Gb
To see if I could get a bigger compression, I unzipped everything to a folder and compressed with Winrar, using what would theoretically be the best compression: RAR4, compression "Best" and "solid archive".
To my surprise, the final size was over 5Gb! How is this possible?