Does updating macOS delete everything?

No. Generally speaking, upgrading to a subsequent major release of macOS doesn’t erase/touch user data. Pre-installed apps and configurations too survive the upgrade.

Can I update my macOS without losing everything?

Reinstalling macOS does not remove data from your Mac. To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Can updating your Mac delete files?

Updating your Mac puts you at risk of getting your files deleted unless the appropriate channels are followed.

What happens when we update Mac?

Software Update now checks for new software. If Software Update finds new software, click Update Now or Upgrade Now to install. You might be asked to restart or enter an administrator password. If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model.

Do you need to backup your Mac before updating?

If you’re planning to upgrade your Mac or iOS devices with Apple’s newest software, you should make it a point to back up before you install these new versions.