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.
![clean install mac os sierra without usb clean install mac os sierra without usb](https://imgix-blog.setapp.com/macos-utilities-high-sierra.png)
Access System Preferences→Users & Groups, and Clock minus button on the bottom in the left panel.
![clean install mac os sierra without usb clean install mac os sierra without usb](https://www.iclarified.com/images/tutorials/62748/302226/302226.jpg)
The Mac will then display all the startup disks available. Just connect the USB disk and press the Option/Alt Key when you hear the boot sound. As said earlier, you could use the macOS USB installer to do a clean install or restore it upon a boot failure.
#Clean install mac os sierra without usb update
When you update or reinstall the macOS, the last thing you want is probably losing data on your computer. First of all, create a new admin account and login with this account. Clean installing or restoring a Mac offline with USB pen drive. Whenever there is a new macOS available, the need to reinstall macOS will surge. There is an easy way to backup each user account on your Mac. USB flash drive you’ll need it to load the macOS Monterey install file and then use it to reinstall the operating system on your Mac (it should be at least 16GB). 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. macOS Monterey installation file just download the operating system without installing it right away. Each user account contains your Desktop files, documents, downloads, videos, music, and pictures. I am running mac os high sierra 10.13.3 and I want to install windows 7 and dual boot my MacBook, I have successfully created a bootable window 7 USB drive with Bootcamp 5 driver on the pen drive, When I start installing windows 7 boot camp show me this message ( Need 64-bit Windows installation USB drive or DVD. This will back up your user account, along with any other accounts on the Mac, plus any shared data. When choosing what to backup manually, most importantly look at the Users folder, located by default at Macintosh HD/Users/.
![clean install mac os sierra without usb clean install mac os sierra without usb](https://i.ytimg.com/vi/anGna2_ckm8/maxresdefault.jpg)
So, If you skip this step, you won’t be able to recover your data if something goes wrong. 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).