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Aug 17, 2016 9:12 AM in response to jucamohedanoby JimmyCMPIT,empty your trash.
what exactly are "files you don't need", because there are files you don't access that are essential for the computer to use and you should not go and erase out of prejudice.
Best practice is backup your disk before you go whacking data.
Use Time Machine to back up or restore your Mac - Apple Support
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