When it is done, backup the disk image to your online/local backup. Select Save the home folder in a disk image and Click Delete User. Access System Preferences→Users & Groups, and Clock minus button on the bottom in the left panel. The macOS High Sierra is the newest version of macOS now. First of all, create a new admin account and login with this account. There is an easy way to backup each user account on your Mac.
If you have more than one user on your Mac, and you’re only interested in backing up your own data, just go one level deeper and select your user account from within the Users folder. Each user account contains your Desktop files, documents, downloads, videos, music, and pictures. Mac OS Sierra is a 4.7 GB download, so you want to make sure you have enough space to store the download file and also keep a backup copy for future purposes.
Click 'Agree' to the accept license agreement. Press 'Continue' in the following screen. After you complete the download of the macOS installer, double click the same from the Applications folder to begin the installation procedure. This will back up your user account, along with any other accounts on the Mac, plus any shared data. Step 2: Installing macOS High Sierra on the External Drive. This is annoying because it prevents a single.
When choosing what to backup manually, most importantly look at the Users folder, located by default at Macintosh HD/Users/. Many Mac users who are attempting to download macOS High Sierra from the Mac App Store will find that a small 19 MB version of Install macOS High Sierra.app downloads to the /Applications folder of the target Mac, rather than the complete 5.2 GB Installer application for macOS High Sierra. So, If you skip this step, you won’t be able to recover your data if something goes wrong.
Instructions on how to do that are on the Internet/Youtube. A bootable ISO or bootable USB can be made from this installer. Note: A clean install of macOS Sierra on the startup drive completely erases all data on that drive including all your files (documents, music, movies, pictures, and even apps). This is the official macOS Sierra Installer from the Mac App Store.