Personally I would avoid most commercial anti-virus software because of their potential for causing problems. You can protect the computer easily using the freeware Open Source virus protection software ClamXAV.

As for virus protection there are few if any such animals affecting OS X. OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. These utilities have limited or no functionality with Snow Leopard and should not be installed. Dependence upon third-party utilities to run the periodic maintenance scripts had been significantly reduced in Tiger and Leopard. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep.

OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. Versions 1.5.1 or later are Intel Mac compatible.

TechTool Pro 4.5.1 or higher are Intel Mac compatible Drive Genius is similar to TechTool Pro in terms of the various repair services provided. TechTool Pro provides additional repair options including file repair and recovery, system diagnostics, and disk defragmentation. For situations DU cannot handle the best third-party utilities are: Disk Warrior DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption Disk Warrior 4.x is now Intel Mac compatible. Kappy's Personal Suggestions for OS X Maintenanceįor disk repairs use Disk Utility.

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