How to Reinstall macOS Mojave without Data Loss?

Summary: Sometimes, you might need to reinstall macOS to fix Mac issues. In this blog, we’ll share the right method to reinstall macOS Mojave so that you won’t lose your valuable data. In case you lost your data due to any reason, download Stellar Data Recovery Professional for Mac software to salvage data from the reinstalled macOS.

How to Reinstall macOS Mojave without Data Loss?

Why even Reinstall Mojave?

macOS require reinstallation in several situations.

  • Mac not behaving properly with the newly installed macOS Mojave.
  • Mac incompatible with the new macOS.
  • There is a bug in your Mac.
  • Or, when you wish to rectify the storage drive partition table, in case Disk Utility fails to repair the drive.

Whatever be the reason, we’ll help you reinstall macOS safely.

Before you begin the reinstallation task, back up your Mac using Time Machine. You can also do it manually using an external storage medium. This is the most crucial step to avoid any data loss.

Reinstall macOS Mojave

Once you’ve backed up your Mac storage drive, proceed further. Connect your MacBook Air or Pro to the power source to avoid incomplete installation of macOS due to power failure. Also, make sure you have an active Internet connection to startup Mac through Internet recovery if macOS Recovery fails. Now, boot your Mac into macOS Recovery mode to erase the startup drive and reinstall macOS Mojave. The steps are as follows:

a) Start or restart your Mac, then immediately press and hold the Command + R hotkey. Release the key when the Apple logo or Globe icon appears. Mac boots into macOS Recovery mode.

command + R Key

b) In the macOS Utilities window, select Disk Utility, then click Continue. In the Disk Utility window, click View > Show All Devices. Select Macintosh HD the startup disk from the sidebar.

Macintosh HD

c) Click the Erase tab to erase the startup disk. Specify Name, Format, and Scheme in the respective boxes, then click the Erase button.

Click Erase Tab

d) Once the drive is erased with the right file system format, quit Disk Utility. In the macOS Utilities window, select the Reinstall macOS option, then click Continue. Perform the on-screen instructions to install a fresh copy of macOS Mojave from the recovery drive or cloud.

macOS Utilities Box

e) Alternatively, you can connect Time Machine backup drive to your Mac. In the macOS Utilities window, select Restore from Time Machine Backup and click Continue. Perform the on-screen instructions to reinstall macOS Mojave and stored data.

Restore From The Time Machine Backup

If macOS Mojave is unavailable through recovery mode, you can use App Store or Web Browser to download and install macOS Mojave. You can also create a USB flash drive to create a bootable installer to install macOS Mojave on multiple Macs.

Use the ‘createinstallmedia’ command in Terminal

a) Connect the USB flash drive for the bootable installer.

b) Go to Applications > Utilities > Terminal.

c) Type the following command and press Return.

sudo /Applications/Install\ macOS\ –volume /Volumes/MyVolume

Here, MyVolume is the name of your USB installer, if not, then change it accordingly. Type admin password when prompted, then press Return. Type Y to confirm, then press Return. Click OK to allow the copy to proceed. When it’s done, the USB drive will have the same name as the installer, for instance, Install macOS Mojave. Quit Terminal to and eject the USB flash drive.

Recover Data from Botched up Reinstallation of Mojave

If you’ve accidentally erased the drive and reinstalled macOS Mojave without taking backup, proceed to the data recovery steps and tutorial video:

  • Launch *the trial copy of Stellar Data Recovery Professional for Mac on your MacBook Air, MacBook Pro, or other Macs.
  • From the Select What To Recover screen, go with Everything or customize your scan by toggling between the respective file types, then click Next.
  • From the Select Location screen, toggle on Deep Scan switch or go with Quick Scan, then click Scan. Deep Scan will take time but the scan result from the reinstalled macOS will be comprehensive.
  • Once the scan is over, preview your files, then select whatever files are required. Click the Recover button. Click Browse to specify a distinct save location preferably an external one, then click Save.
  • Wait till the recovery is over. Navigate to the save location to check the recovered files. Finally, restore the recovered files to the reinstalled macOS Mojave.

Data Recovery Video after macOS Mojave Reinstallation

*The trial copy of Stellar Data Recovery Professional for Mac is all you need to scan and preview recoverable files. And if you want to recover your data, activate the software. Also, get a 30-day money-back guarantee, if you are not satisfied.

Also, if you need free software that allows 1 GB data recovery capability, then use Stellar Data Recovery Free Edition for Mac. The software is sure to help recover data without paying any buck.


This blog focused on how to safely reinstall macOS Mojave. First off, back up your Mac using Time Machine. Once the backup is taken, restart your Mac and immediately press and hold Command + R hotkey. Release the key when the Apple logo appears. Your Mac will boot into macOS Recovery mode. Now, from the macOS Utilities window, use Disk Utility to erase the startup disk, then use Reinstall macOS to reinstall the operating system to macOS Mojave.

In case, you’ve accidentally reinstalled macOS without taking backup, don’t worry! We’ve got you covered. Leverage professional data recovery software for Mac to scan and retrieve files from the reinstalled macOS. The tool is compatible with macOS Mojave and other latest as well as legacy macOS.

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