In Arch when ever you install a package it is downloaded to your system. This make perfect sense because how else are you going to install it… What most people don’t realize is that those packages stay on the system forever unless you purge them.
This can be nice sometimes, especially if you want to re-install a package which you previously removed.
Purging your packages once in a while will free up a lot of free space on your machine and it will help to keep your system clean. To purge the copies pacman keeps just run the following command and say yes to both questions: