Will Reinstalling macOS Delete My Files?
Contents Can You Reinstall macOS Without Losing Data? the Good News Is That, If You Follow the Instructions Strictly to Update Your Mac Operating System, the...
Can you reinstall macOS without losing data?
The good news is that, if you follow the instructions strictly to update your Mac Operating System, the chance to lose data on your Mac is quite slim, since a reinstallation just needs to create a new copy of the OS, your existing files stored on your Mac won’t be lost.
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What happens if you reinstall macOS?
2 Answers. It does exactly what it says it does–reinstalls macOS itself. It only touches operating system files that are there in a default configuration, so any preference files, documents and applications that are either changed or not there in the default installer are simply left alone.