Starting with macOS Sierra, a deeper integration with Apple’s iCloud service made cloud backups seamless on a Mac. If you don’t mind the extra time and care, it’s also recommended that you use an additional hard/flash drive to store just the data you will copy back to the ‘refreshed’ Mac. We recommend Time Machine for a complete system backup. This way you’ll back up important data, files and pictures so you can access them after the clean install. Using the built-in local backup feature, Time Machine, you can save all the data from the Mac on an external hard drive. This is why the first step of a clean install is data backup. A clean install involves formatting the disk all data will be erased, and that’s irreversible. A clean install, on the other hand, erases everything on the Mac, so the preparation phase – or backing your data up – is very important. The main difference between the two is that the latter preserves all user files, apps and preferences while reinstalling macOS itself, and is mainly used for troubleshooting. We have to stress that a clean install is not the same as a reinstall. Some experts recommend a clean install with every major macOS release for optimal performance, but that’s not necessary for a regular user. Sometimes advanced Mac users may feel the need for a clean install of macOS.
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