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• Reinstall Catalina Without Losing Data
• Install Catalina Without Losing Data
• Reinstall Catalina Without Losing Data
• How To Install Mojave From Catalina Without Losing Data

How to Reinstall mac OS Without Losing Personal Data. Reinstalling macOS (sometimes also called a “factory reset”) is usually a rare event, and you shouldn’t have to worry about it too much. But there are specific issues, self-inflicted or not, that are much quicker resolved with a clean installation of the OS. To reinstall macOS, including the latest Big Sur, Catalina, Mojave, without losing data, you can follow the professional guide to update the OS, which will not cause data loss in most of the case. If you still have worries, back up your Mac in advance or recover the lost files with EaseUS Data Recovery Wizard.

If you feel like your MacBook Pro or MacBook Air has deteriorated from its usual performance and speed, you can always choose to reset your MacBook. However, many users perform a full factory reset on Mac without any precautions or backups that lead to data loss. With this informational write-up, you will get to know the most efficient and safest way to reset iMac, MacBook Pro, or MacBook Air. Stick till the end to know how to reset MacBook Pro without losing data.

Can I Reinstall macOS Without Losing Data?

Yes, you can reinstall macOS on your MacBook Pro or Air without losing any data if you have properly followed the reset procedure. With the help of the Disk Utility, you can erase the data and volume to proceed with the reinstallation of your macOS. Read the next section to know the steps which need to be done to reset MacBook without losing data.

Things to do to Reset Mac Without Losing Data

There are 4 important things that need to be done before you try to reset your MacBook.

1. Backup on an external storage drive with the help of Time Machine Utility
2. Log out of all the Apple-based applications
3. Reset and reinstall the macOS with the steps that will be mentioned below
4. Initiate the process to restore data after resetting MacBook

Let us get to know how you should back up the data using Time Machine so that you can efficiently restore it later. But, what if you have already reset your MacBook Pro or Air without taking a proper backup?

What to do After Resetting MacBook Without Backup?

If you have formatted, erased or reset your MacBook without any backup, your files and other program data will be permanently deleted. However, you need not be worried as those files and data can be easily recovered with the help of a professional Mac data recovery software. This software known as Remo Recover will scan and recognize data that has been formatted, accidentally deleted or lost due to any circumstances.

Remo Recover is one of the top Mac data recovery tools that has a self-explanatory interface which makes it very easy even for the most novice Mac users. Download now to scan and preview the recoverable files for free.

Some Rewarding Benefits of Remo Recover:

• Can recover data from file systems such as APFS, HFS, HFS+, HSFX, ExFAT, etc.
• Works on all the storage drive that you use on your MacBook like SSD, USB, Memory Cards, etc.
• Supports recovery from all the macOS versions like Catalina, Mojave, High Sierra, El Capitan, Yosemite, Mavericks and all the other versions
• Efficiently recovers iWork files from your MacBook or Mac computers
• Data loss scenarios such as lost, deleted, formatted or reformatted volumes are covered by Remo Recover
• Choice of selectively recovering desired files rather than recovering all of them
• Can recover more than 300+ file types from your MacBook. This makes the recovery process very efficient

Note: If you have not performed a reset on your MacBook Pro or MacBook Air yet, please skip the above-mentioned suggestion and follow the steps given below.

How to Backup Mac Before Wiping or Resetting?

To start the Time Machine backup process, connect an external storage drive to your MacBook, and follow the steps mentioned below.

Step 1: When a window is prompted with how to use this drive, select Use as Backup Disk.

Step 2: If no window is prompted while inserting the external drive, search for Time Machine, and then click in Select Backup Disk.

Step 3: Select the backup preference and then follow the on-screen process. The Backup will be created.

Note: The initial Time Machine backup will take some time, so do not assume that the backup has been crashed or frozen. Wait patiently.

What to Check Before Resetting Your Mac?

Before trying to reset your MacBook Pro or MacBook Air, there are few things that need to be checked to prevent errors. To avoid conflicts while logging into the applications and programs after the MacBook has been reset, below mentioned are some of the steps that need to be done.

1. Deauthorize iTunes from your MacBook Pro or MacBook Air
2. Turn off the File Vault if you have enabled it and remove files from it before turning it off
3. Sign out from iCloud before resetting the MacBook
4. Sign out of iMessage

Once these preferences and settings have changed and signed out. You can proceed to reset your MacBook Pro without losing data.

Steps to Reset and Reinstall macOS Without Losing Data

To reset your MacBook Pro without losing data, click on the Apple menu and click on Restart. Follow the next steps as given below.

Step 1: Hold the Command + R keys until the MacBook’s utility window hasn’t opened.

Step 2: Select Disk Utility and click on Continue.

Step 3: Select your startup disk (usually labeled as Macintosh HD) and click on Erase which will be present at the top toolbar

Step 4: Select the format as MAC OS Extended (Journaled) and click on Erase.

Step 5: Wait till the MacBook is completely reset and then go back to the Disk Utility’s main window.

Step 6: Select Reinstall macOS and click on Continue.

Step 7: Make sure you are connected to a WIFI before proceeding with reinstalling the macOS.

Once, the macOS is successfully reinstalled, your MacBook will be reset to factory settings and the performance will be as fast as it is new. However, to complete the process of resetting MacBook without losing data, follow the final steps that need to be done.

Method to Restore Data After Factory Resetting Your MacBook

Once the MacBook is turned on again, connect your external storage drive where you have backed up data using Time Machine. Follow the steps mentioned below.

Step 1: Search for Migration Assistant and click on Continue.

Reinstall Catalina Without Losing Data

Step 2: Select From a Mac, Time Machine backup, or startup disk and click on Continue.

Step 3: Click on the applications, programs, and files that you want to backup and click on Continue.

Once this process is complete, all the files that were present before resetting your MacBook Pro or MacBook Air will be restored. Thus, you should have successfully performed MacBook SSD data recovery. As mentioned earlier above, if by chance you have forgotten to take a backup or lost your backup drive, make use of the Remo Recover software to recover data that was deleted due to formatting.

Are you trying to revert or downgrade your new macOS or Mac OS X to the previous version on the Mac computer? If yes, stay here. Just follow the provided guidance below to bring your previous macOS or Mac OS X back without losing any data:

Methods on this page can be applied to all Mac systems including the latest Big Sur, Catalina, Mojave, High Sierra, Sierra, and old Mac OS El Capitan, etc.

Tip: Backup Mac data before downgrading macOS or Mac OS X

It's highly recommended for you to back up all important Mac data first before you start downgrading Mac OS to an older system.

You can either choose third-party Mac backup software to back up Mac data to an external hard drive at once or choose Time Machine to back up all wanted data with ease.

Considering data security, it's also highly recommended for you to backup all important data into an external hard drive.

If you prefer to use Time Machine, here are the details:

• Click 'Finder' > 'Preference'> Check 'Hard disks box' underShow these items on the desktop.
• Open the backup disk and create a file folder and name it, for example, 'My Backup'.
• Open the Mac disk and click'Users' file folder > Select all files and data that you want to back up and drag to the My Backup file folder.

Wait for the process to finish. After backing up all data, then you can start to revert macOS with ease. Here, you'll find two methods for you to downgrade macOS without losing data and you can choose either one as a guide.

Method 1. Downgrade macOS or Mac OS X with Time Machine

So if you have created backups for your Mac data and macOS, follow the below steps for a guide. If you haven't created such a backup, please jump to Method 2 to downgrade Mac OS.

1. 1. Start or restart your Mac and hold command+ R keys to enter theRecovery Mode, or hold the Option/Alt and then choose the Recovery option.
2. 2. Insert the hard drive used for Time Machine and chooseto Restore from Time Machine Backup under OS X Utility, choose the inserted hard drive.

1. 3. Choose the most recent data and time when the Mac was still running the current macOS.
2. 4. Select the main disk drive where the backup was stored and it is usually named Macintosh HD. Click Restore.

Then all you need is to wait for the computer to restore and gain Yosemite again. It will usually take a few hours or all day long, depending on how much data need to be restored.

Install Catalina Without Losing Data

Method 2. Create USB Boot Drive and Revert Back to Old macOS or Mac OS X

This method is set for users who have no Time Machine backups. And if you have no backups of your current macOS or Mac OS, use Time Machine to back up your important data first and the system first.

Then follow the below steps to downgrade Mac OS now: (The ways to download new macOS and old Mac OS X are different. Make sure that you've followed the right guide for downgrading the Mac system.)

Downgrade macOS (e.g: Downgrade macOS Mojave to High Sierra)

1. 1. Plug an external USB drive (with 16GB min), launch Disk Utility, and select the USB drive, click Erase.
2. 2. Rename the USB drive as 'MyVolume' and choose APFS or Mac OS Extended as the format, click Erase. Quit Disk Utility when the process is done.

3. To to Finder and launch Terminal, type: -sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS High Sierra.app and hit Return.

1. 4. Enter your Admin Password as required, wait until the process is done.
2. 5. Restart the Mac, hold the Option key.
3. 6. When the option to select a boot disk appears, choose the installer disk (the external USB drive) you created.
4. 7. High Sierra will start the installing process. When it's finished, restart your Mac and the Startup Assistant will appear. Then go through the steps to set up your Mac.

If your Mac is shipped with Mojave, you can directly downgrade Catalina to Mojave with the below tips:

1. 1. Restart Mac, hold Command + Option + Shift + R keys to boot into Recovery Mode. You can also press Command + R to enter the Recovery Mode.
2. 2. Click on 'Disk Utility', select the disk with Mojave installed, and click 'Erase'.

1. 3. Rename the disk, select Mac OS Extended or APFS as the file format, click 'Erase'. Quick Disk Utility by then.
2. 4. Re-enter the Recovery Mode, and select 'Reinstall macOS' and press 'Continue'.

By doing so, the old High Sierra will be installed on your Mac automatically.

Downgrade Mac OS X (e.g: Downgrade Mac OS X Yosemite to El Capitan)

1. 1. Download the OS X Yosemite installer from Mac App Store.
2. 2. Download the Diskmaker X app to create a bootable USB drive for El Capitan's downgrade.
3. 3. Insert a USB drive into Mac, launch Diskmaker X, and choose OS X Yosemite 10.10. Then the Diskmaker X will do the rest jobs for you.
4. 4. Keep the USB drive inserted into the PC, restart Mac. Hole Option/Alt and chose USB drive in the menu while rebooting Mac.
5. 5. Go to Utilities and select Disk Utility at the Install OS X menu.
6. 6. Select Macintosh HD and choose Erase. Be sure that selected under the Format field is Mac OS Extended (Journaled).
7. 7. Return to Install OS X menu and select Continue to begin the installation of OS X Yosemite.
8. 8. After all these, all you need is to be patient in installing Yosemite on your Mac.

Bonus Tip: Restore Lost Data after Downgrading macOS/Mac OS X(without backups)

This method is for users who have forgotten to back up important data before downgrading Mac OS. And if you lost data after Mac OS reinstallation or downgrading, here is the solution - to restore lost data after Mac OS X downgrading or reinstallation with powerful Mac data recovery software.

EaseUS Mac data recovery software supports to restore whatever you lost in Mac and it's fully compatible with all Mac OS above 10.8

And if you happen to lost important data after Mac OS downgrading, let EaseUS Data Recovery Wizard for Mac help you out. Three steps will do all jobs.

Reinstall Catalina Without Losing Data

Step 1. Select the disk location (it can be an internal HDD/SSD or a removable storage device) where you lost data and files. Click the 'Scan' button.

Step 2. EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane.

How To Install Mojave From Catalina Without Losing Data

Step 3. In the scan results, select the file(s) and click the 'Recover Now' button to have them back.