I want my Mac running top performance and likewise keep my files safe so I do the following: Backup up all my drives (Time Machine, Chronosync -using internal and external drives with my Mac Pro) Run OSX 's Disk Utility (in the "Applications/Utility" folder) and AppleJack (unlike Disk Utility it can check the boot drive but without needing the OSX system DVD) to check/fix my hard drives and permissions Have Trim Enabler turned on for my boot/OSX-SSD Use Amnesia for removing software so as not to leave unnecessary files behind However I believe I might need more extensive tools for really checking the hard drives for errors before they escalate and I'm for one puzzled about this whole permissions thing (having run Disk utility to fix this once, and immediately running it a second time and still finding permission errors I'm asking myself it really does fix anything, or does it the wrong way. Likewise, Applejack seemingly fixes permissions but they still come up wrong in Disk Utility). I'm really looking for a tool which doesn't need a whole lot of knowledge on how to use (a single "check and fix" button would be great as opposed to the numerous geeky stuff most of these tools have). I see that Micromat sells a TechTool Pro/CheckMate bundle for US$ 49 until May 1st 2013 and Disktools Pro comes as part of the Name your own price Mac bundle 2.0 for US$ 9.75 (good for 5 more days at the time of writing). I've also seen recommendations for TinkerTool System 2 costing 10 Euros. Finally there's DiskWarrior which I've heard a lot of good stuff about, but costing US$ 99.95 (haven't found any deals or bundles on that one). Do you suggest I get one of these or are they for the most part unnecessary?