But just in case of bad luck, we need to do some work on BACKUP, this is crucial for macOS reinstallation without losing data. In fact, reinstallation of macOS doesn’t necessarily cause lost data, it just create a new copy, your existing files and data saved in programs won't be altered or deleted. We all save tons of data on our Mac, so when we decide to reinstall macOS Big Sur/Catalina, the top concern always goes to “will I lost everything if I reinstall macOS”. Support Big Sur, Catalina, Mojave and earlierįree Download 3 Steps to Reinstall macOS Big Sur or Catalina without Losing Data.
Therefore, doubtless, there will be new versions of macOS available to upgrade and reinstall.Īs we all know, for no specific reason, system reinstallation can magically solve a slow Mac in most cases. Reinstall When There is New macOS Version AvailableĪpple keeps working constantly to fix bugs, make performance tweaks, add new features or enhance coding.If you have installed Big Sur, Catalina, Mojave or earlier versions, you may have to reinstall macOS for following reasons: