Following a recommended maintenance schedule for your iMac will help you avoid problems and keep your computer running smoothly. Use this iMac maintenance guide as a handy reminder.
Task Schedule
Check for updates within System Preferences Automatic setting (Software Update pane in System Preferences)
Back up with Time Machine Automatic
Defragment (using Prosoft Engineering Drive Genius 5) Once a month
Delete unnecessary user accounts As necessary (Users & Groups pane in System Preferences)
Scan for viruses (using VirusBarrier Scanner from Intego) Automatic
Check all volumes for errors (using Disk Utility) Once a week
Check for the latest drivers for your external hardware Once a month (or after adding new hardware)
Delete temporary Internet cache files and old system logs (using the Mojave Manage Storage feature) Once a week

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Mark L. Chambers is a technical author, computer consultant, programmer, and hardware technician with over 30 years of experience. He has written over 30 computer books, including MacBook For Dummies, 9th Edition and Macs For Seniors For ­Dummies, 4th Edition.

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