Maintenance is vital if you want to keep Mac OS X Snow Leopard in tip-top condition for as long as possible. Maintaining your Mac keeps it running fast and smooth. Basic housekeeping includes regular back-ups plus some other, less familiar, tasks. Check this table often, or print it and keep a copy near your desktop!

Mac Maintenance Task Schedule
Check for updates with Software Update Once a day (automatic setting)
Back up with Time Machine Hourly (automatic setting)
Defragment (Micromat TechTool Pro/Prosoft Engineering Drive Genius 2) Once a week
Repair Disk Permissions (Disk Utility) Once a week
Delete Unnecessary User Accounts (System Preferences) As necessary
Scan for viruses (Intego VirusBarrier X5) Once a week (automatic setting)
Check all volumes (Disk Utility/ Micromat TechTool Pro) Once a week
Check for the latest drivers for your hardware Once a month (or after installing new hardware)
Delete temporary Internet cache files (Prosoft Engineering Drive Genius 2) Once a month