Note that reinstalling macOS system software should not impact any data, as it will attempt to only reinstall the operating system itself without mucking about any personal documents, apps, or other data. If you don’t want to use Time machine, or if Time Machine is not an option for whatever reason, you can also choose to reinstall Mac OS system software. Of course Time Machine rolls back to whatever the state was when it was last backed up, so if the backup is a week old then you’d lose data between then and now unless you specifically make copies of that data. If you have Time Machine setup to backup your Mac and you do so regularly (and you should), then using a Time Machine restore can be the best approach for some users. If you have accidentally deleted a system file and now something is clearly not working as it should, you have two realistic options: restore the Mac from a backup you made prior to deleting the system file, or reinstalling Mac OS system software.
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