I just finished installing OS X Mavericks on my Mid-2010 iMac. I've always taken care of the OS by doing permissions repairs, executing Onyx automation and uninstalling the apps I don't use. While my OS does run smoothly, I do worry about the files and such I've left behind (I recently discovered that there were a lot of remains of uninstalled apps in the Library folder). As some people seem to be paying a lot for paid maintenance apps, I'm worried that I'm missing on something. There seems to be at least three types of maintenance apps for file management: Apps that delete unnecessary files: Disk Doctor Apps that find duplicates and delete them: Duplicate Detective Apps that map the locations of large files: Disk Map All three apps are by Fiplab and cost only a few dollars. They seem to be popular. Obviously a better alternative to Disk Map might be Daisydisk, but the cost is a bit too much. My question is this: Are these kinds of paid apps good to buy and use (do they do in-depth things that an average person would find difficult to do manually), or would an average person with under 200Gb of used space use these only once a year tops without any benefits?