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This page covers the full process of how to update and install the latest macOS Big Sur, Catalina, Mojave, etc. on Mac without losing any data. If you need a detailed guide, follow through this page to get the desired macOS installed on your computer now:

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MacOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy. Disk Drill: The best data recovery software for Mac OS X. Recover deleted or lost data from any storage device, iOS and Android. Download Old Stable Apache Flink Release for Mac OS. For the latest release, we can just look in the first paragraph for the link. But for the old release such as Flink Version 1.7.1, you need to select from the old stable release list present on the same page.From the list select the binaries in front of the desired version and then download a binary file that contains the -bin-scala in the.

Applies To: macOS Big Sur, macOS Catalina, macOS Mojave, macOS High Sierra, macOS Sierra, or earlier Mac operating systems

The need to update or reinstall your macOS always follow the release of a new operating system, the slow performance of your Mac, or a system crash. When it comes to reinstalling macOS, users biggest concern is losing data on their computer.

The good news is that, if you follow the instructions strictly to update your Mac Operating System, the chance to lose data on your Mac is quite slim, since a reinstallation just needs to create a new copy of the OS, your existing files stored on your Mac won't be lost. Thus, as long as you don't choose to erase your startup disk during the reinstallation, you won't lose files. However, you know what 'Slim' means - it's not 100% safe and is still at the risk of losing some data.

Then how to reinstall macOS without any data loss? To provide a double guarantee to the precious data on your Mac, you can make a copy of the files on your Mac before you perform the reinstallation, or equip your Mac with a data recovery tool that can rescue your data after the reinstallation.

Preparations you Need to Make Before You Reinstall macOS

To reinstall macOS on your computer smoothly. Follow the tips below to prepare your Mac ready for the new macOS update now:

• Leave at least 2GB memory and 8.8 GB storage space on your Mac
• Leave at least 45% battery on your Mac
• Connect Mac to the internet or WiFi
• Update your Mac Apps to the latest versions
• Backup all your personal data and even create backups for your present Mac data through Time Machine

Remember to back up your Mac to an external hard drive for preventing system update failure or unexpected troubles from happening. Then follow the detailed guide below to reinstall Mac OS via macOS Recovery mode, which enables you to reinstall macOS, restore your files from Time Machine, repair or erase a disk, and more.

How to Update & Reinstall macOS Without Losing Data

*Print this page or open this page on another device so you can refer to it later.

Step 1. Start up your Mac from macOS Recovery

• Turn on your Mac and immediately press and hold 'Command + R', 'Option + Command + R', or 'Shift + Option + Command + R'.
• Release the keys when the Apple logo, a spinning globe, or a pop-up for a firmware password appears.

Step 2. Select 'Reinstall macOS' from the Utilities Window and click 'Continue'.

Step 3. Follow the onscreen instructions to select the hard drive you want to install the OS on and start the installation.

Step 4. Don't put your Mac to sleep mode or close its lid during the installation. It's normal to see your Mac restart several times or the screen is white while you reinstall the Mac OS. Just wait patiently for the process to finish.

If data loss occurred after you reinstalled macOS, you can follow the next part to recover your missing files.

Big Data Microsoft

Recover Lost Data After macOS Reinstallation

Big Data Mac Os Downloads

If you have backed up your Mac before the reinstallation, you can retrieve your data from Time Machine, an external hard drive, or somewhere else, depending on the way you used to make the backup. If you haven't created any backups for your Mac, then you'll need the professional Mac data recovery software tool - EaseUS Data Recovery Wizard, to perform data recovery. With the help of this tool, you can easily recover the data lost due to macOS reinstallation:

Step 1. Select a location and start scanning.

Launch EaseUS Data Recovery Wizard, hover on the location(hard drive partition, external HDD, Card devices) where you lost data, then click 'Scan'.

Step 2. Preview and select the files.

Wait until the scanning completes. If you need to double-click the item to preview the file, then select the data you attempt to recover.

Step 3. Recover lost data.

Click 'Recover', choose a location to save the recovered data, then click 'OK'. You should store the data in another place instead of the original one.

There are lots of data recovery tools available. But EaseUS Data Recovery Wizard, one of the best Mac data recovery tools, is our pick. It fully supports all macOS systems including the newest Big Sur, Catalina, Mojave, High Sierra, Sierra, EI Capitan, Yosemite etc. It allows you to restore all lost data with simple clicks. Office files, music, videos, emails or other archives can all be restored on your own.

by Shirly Chen, updated on 2020-10-25 to Mac Data Wipe

Summary:
Data erasure is the best method to completely erase data from a hard drive or digital device to prevent data recovery. In this article, we will show you an easy and reliable macOS Big Sur data erasure tool, and use it to securely and permanently erase data from HDD, SSD or digital device under macOS Big Sur.

How to permanently erase data in macOS Big Sur? Deleting data from Mac OS is one of those steps that may be difficult for several reasons. One of them is because Mac OS has a fairly strict system that makes it difficult for users to permanently delete data.

If you are in the midst of permanently deleting data from Mac OS Big Sur system for some reason, such as wanting to sell your MacBook, then there are a number of steps you can take. One of the recommended methods is to use a macOS Big Sur data erasure tool - DoYourData Super Eraser for Mac. We'll see why this method is so safe and easy. But before that, let's cover the conventional method if you want to try it.

1. Format and Quick Format SSD under macOS Big Sur

You can use the conventional method, namely by using the SSD Format and Quick Format features on the Mac. The way to do this is as follows.

• Open Disk Utility, this is the built-in software from Mac OS which is commonly used to completely erase data without leaving any residue.
• After the software opens, please click on the Erase menu at the top. This menu will sweep all the contents of a folder or Drive that you select.
• Done.

This method has weaknesses. First, Disk Utility cannot format a drive containing a file system. So if you want to format the whole disk, you can't go this way. Second, Disk Utility does not permanently delete data. Even though it looks permanent, you can still recover data using Mac Data Recovery App. So, this method is not safe.

2. Using macOS Big Sur data eraser - DoYourData Super Eraser for Mac

This is the second method and is the recommended method. Here are the steps you should take to be able to permanently delete data under macOS Big Sur. DoYourData Super Eraser for Mac is an award-winning Mac data erasure application. It offers certified data erasure methods to help Mac users securely and permanently erase data from HDD, SSD, memory card, USB flash drive, digital camera, etc. Once your data is erased by DoYourData Super Eraser for Mac, the erased data is gone forever, can’t be recovered by any data recovery software. If you want to permanently delete or erase data in macOS Big Sur, just download DoYourData Super Eraser for Mac.

Download and install DoYourData Super Eraser for Mac on your Mac, then open it. It offers three flexible modes to help you securely and permanently erase data, making data recovery be impossible.

Mode 1. Permanently shred files in macOS Big Sur.

Please select this mode if you want to delete specific files or folders without erasing the entire disk contents. Select the files/folders and then click 'Erase Now'.

Mode 2. Wipe hard drive in macOS Big Sur.

This is the best way to clean all the contents of the SSD you want. Select this menu and choose which drive you want to clean. After that, click 'Wipe Now' to start the cleaning process. All the data on the hard drive will be permanently erased.

If you want to sell or give your Mac to someone else or just want to clean the SSD, then this mode is the right choice.

Mode 3. Erase deleted data in macOS Big Sur.

This is the third mode you can use to erase the deleted data on your hard drive. It will not affect the existing data on your hard drive.

DoYourData Super Eraser for Mac is 100% safe data erasure software. It will not cause any damage to your SSD, HDD or macOS Big Sur system. It also can help you uninstall useless applications, clear browsers’ caches, and format hard drive, etc. Download it here:

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