Deleting Files on Macbook Air
How do I delete all personal files on my old MacBook Air without deleting anything on my current MacBook Air or my iPhone?
MacBook Air 13″, macOS 13.4
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If you are trading in or giving away the Mac follow the steps in the support document linked below to erase the Mac entirely. This will not affect anything on other devices.
click here ➜ What to do before you sell, give away, trade in, or recycle your Mac - Apple Support