Sep 28, 2020 • Filed to: Solve Mac Problems • Proven solutions

'Is it possible to reinstall macOS without losing data?'

Jun 29, 2020 Apple has confirmed that Boot Camp will not be available on Mac ARM machines. When these computers arrive, they will not support Bootcamp. This is the software that allows alternative operating.
Apple has confirmed that Boot Camp will not be available on Mac ARM machines. When these computers arrive, they will not support Bootcamp. This is the software that allows alternative operating.

If you have a similar question in mind, then we have got you covered. Just like any other computer, Mac systems can also suffer from unwanted issues at times.

In this guide, we will teach you how to boot Mac into recovery mode and reinstall macOS without losing your data. Let's explore this macOS solution in detail.

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When to reinstall macOS?

There are all kinds of reasons for us to reinstall macOS on the system. The following are some of the common problems that force a complete reset on a Mac.

Firmware issues – Mostly, a firmware issue related to macOS demands a reinstallation of the operating system. It can happen when macOS seems to malfunction and can't complete the needed operations.
Startup issues – Apart from the firmware, there would be a problem with your Mac's startup or bootstrap program as well. Mostly, the issue is resolved by visiting the Mac recovery mode.
Corrupt OS – Ideally, your macOS can get corrupt or compromised due to different reasons. In order to fix it or run troubleshooting, you would need to reinstall the OS.
Malware attack – A virus or malware can also infect the core function of macOS and would demand a complete reinstallation of the tool.
Other issues – There could be numerous other issues with your Mac as well that would demand a reinstallation. For instance, if your system has been upgraded to a corrupt macOS version or the update was halted in between, then you need to reinstall OS X.

Preparations before reinstalling macOS

Before we teach you how to reinstall macOS X, there are certain vital things that you need to consider.

Mostly, it takes 30 minutes to 3 hours to reinstall macOS (the exact time would vary among different OS and system models). Therefore, your Mac should be charged enough to complete the installation.
During the reinstallation process, your Mac might be overheated or restart multiple times. It is recommended to not keep it in direct sunlight or a hot place during the process.
Chances are that your existing data on Mac might be deleted after the reinstallation. Thus, you can consider taking its backup if you don't want to lose it.
Disconnect all the attached units like USB drive, SD card, etc. from your Mac beforehand. Also, if you think your system has been infected by malware, then consider formatting it as well.
Your system might download the needed patches and updates during the process. Keep your Mac connected to a stable internet connection for a seamless updating.

Once you are ready, simply take the following steps to reinstall macOS without losing its data.

How to Reinstall Mac OS?

Step 1: Backup Files on Mac

If you don't want to suffer from an unexpected loss of your important files during the reinstallation, then you should take a backup of your data beforehand. There are different ways to backup data on Mac.

1. Backup files Using Time Machine

Time Machine is the inbuilt solution to backup data on Mac and restores it afterward. If you do not want to let go of your important files during the reinstallation process, then consider taking their backup beforehand. You can use an external data source so that Mac can create a Time Machine on it. Mostly, Time Machine will detect a connected unit and would ask you to take its backup automatically. If not, then follow these steps to back up your Mac data using Time Machine.

Simply connect a secure data storage to your Mac and launch Time Machine by visiting Menu > System Preferences > Time Machine.
Here, click on the 'Select Backup Disk' so that you can manually choose a location to save the backup content.
As a pop-up screen would appear, just select the available drive and confirm your choice. If you want, you can choose to encrypt your data as well.
To further customize things, you can visit its 'Options' and even enable the automatic backup feature.
As a pop-up screen would appear, just select the available drive and confirm your choice. If you want, you can choose to encrypt your data as well.

2. Backup files Using Cloud Storage

As you know, Time Machine will only take a manual backup of your Mac data to a dedicated storage unit. If you want to save your data on the cloud, then take the assistance of iCloud, Google Drive, Dropbox, OneDrive, or any other cloud-based service. Since iCloud is the native cloud storage solution from Apple and an inbuilt Mac app, it is widely recommended. You can easily backup files to iCloud from Mac by following these steps.

Firstly, go to System Preferences and launch the iCloud app. If you are not logged in, then enter your Apple account details to sign-in.
The iCloud app has options to sync various data types. Simply enable the features (by checking it) and turn on the backup feature.
There is an 'Option' button adjacent to some data types (like Photos) that you can visit to customize your backup.
You can go to the 'Manage' section from here to view how much space is left on iCloud. Since only 5 GB of space is provided for a free (basic) account, you can also upgrade your account as well to get more space on iCloud.

3. Backup files Using External Hard Drive

If you are running short on time, then you can also take a manual backup using an external hard disk as well. Just connect the hard disk to your Mac and make sure that you are using a hard drive that is compatible with your macOS. Now, simply copy the content from your Mac's storage that you wish to save and paste it to the external hard disk. In this way, you would be able to maintain a second copy of all the important data at a dedicated source.

In contrast, you need to know how to recover files from external hard drives.

Step 2: Boot Mac in the Recovery Mode

Once you have taken a backup of your Mac data, you need to restart in the recovery mode. The Mac Recovery Mode is a dedicated module in the operating system that provides all kinds of firmware and disk-related options. You can run disk utilities via the Recovery Mode on MacBook, reinstall macOS, recover Time Machine backup, and do so much more. In order to learn how to restore Mac in recovery mode, follow these steps:

Firstly, go to the main menu by clicking on the Apple icon and choose to restart your system.
While the system is restarting, press the Command and R keys at the same time till your Mac enters the Recovery mode.
When you get the utility window on the screen, just click on the 'Reinstall macOS' option and continue the process.

Please note that if you wish to upgrade your Mac instead, then press the Option + R keys instead of the Command + R key combination.

Step 3: Erase the Mac Hard Disk

This is an optional step during the reinstall macOS process as a lot of people would like to delete the existing data on their system. If you are reselling your Mac or your system has been infected b

Mac Bootcamp App Data