For over a decade I have managed a few modest Concrete websites for community organizations. I routinely do the Concrete version upgrades and never think much about what happens in the background until I got a warning from my hosting service that I had exceeded 90% of my limit for inodes (files). My limit was 1,000,000! Where had all these files come from? Turns out that apparently Concrete upgrades leave thousands of files from previous upgrades just sitting in tmp directories. I got this extension for my sites and quickly brought my inode count down to 20%. Now I routinely use it to clean up stuff after upgrades.