> If RAR encounters a file ten times, it will compress once and store it and nine pointers. A bunch of compression formats do that. Even zip files can, which l

> If RAR encounters a file ten times, it will compress once and store it and nine pointers. A bunch of compression formats do that. Even zip files can, which leads to interesting tricks like: https://www.bamsoftware.com/hacks/zipbomb/ https://www.bamsoftware.com/hacks/zipbomb/