![]() No backup: There are many Mac users who save their important data on the main hard drive without creating any backup of data.Here, we are going to list some of the factors you must know before you reinstall: You might don’t know that there are many factors that can cause data loss after reinstalling macOS. But they’re also what you do if something really bad happens to the copy of OS X that you boot your Mac from, or if the version of OS X on your Mac is earlier than 10.10 Yosemite. The following instructions do triple duty: Of course they’re what you do to install OS X for the first time on a Mac or a freshly formatted hard or solid-state disk. When the process is complete, press command+Q to close Disk Utility. Change the format to Mac OS Extended (Journaled). Choose a new name for your Mac’s hard drive. Click the Erase button at the top of the window. If you don’t see it, go to View Show All Devices. Select your new hard drive from the sidebar. To reinstall macOS, including the latest 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. When you update or reinstall the macOS, the last thing you want is probably losing data on your computer. Whenever there is a new macOS available, the need to reinstall macOS will surge.
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