how do I back up my Mac computer
how do I back up my Mac computer
iMac 21.5″ 4K, macOS 12.4
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the easiest way is with apple's Time Machine. please see Back up your Mac with Time Machine - Apple Support
and a good strategy will incorporate some redundancy. maybe two separate copies of Time Machine kept up to date, as well as a copy of your backup off-site in case of fire, theft or natural disaster.