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In the left side of the pop-up window toggle the switch from OFF to ONД¤. Go to System Preferences в†’ Time MachineДЈ. One of the easiest ways to clean your Mac is to use an app such as MacKeeper that will easily and quickly delete all useless and duplicated files while keeping the useful stuff intact.ДЄfter cleaning your Mac, itвЂ™s time to back up your important files.Дў. Therefore, you have to delete all this junk before backing up your data.

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Obviously, you donвЂ™t want to install a new macOS and have tons of junk files and unused apps. Why? Well, your Mac might get slow due to system junk and other unneeded files. Back up your dataД«efore backing up your data itвЂ™s always a good idea to clean your Mac first.

Patience: Obviously, this process will take some time so you need to make sure you have an hour or two to spareДЄfter making sure everything is ready, itвЂ™s time to prepare your Mac for the installation.

For this reason, you need an external HD that is at least the same size as your MacвЂ™s internal memory

External hard drive (optional): You need to back up your data to save your important files before installing the new macOS.

Make sure the installer is fully downloaded (about 5 GB)

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Good internet connection: You need to download the macOS High Sierra installer from the App Store.

Blank USB drive: You need a flash drive that has at least 16 GB of available storage space to create a bootable macOS High Sierra installer.

Requirements to create a macOS High Sierra bootable USB driveД¬reating a bootable drive with a High Sierra installer is quite simple.

Installing macOS the clean way (using a non-startup drive).

Creating a bootable USB using the Terminal.

Requirements to create macOS High Sierra bootable USB drive.

ItвЂ™s not hard at all, and in this article, we will guide you through: It makes sense to create a bootable USB flash drive to install the High Sierra operating system if you want to quickly install it on several Macs without having to download the installer each time. The app will help you delete junk, duplicates, and unnecessary apps in a couple of clicks.

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MacKeeper allows you to free up necessary gigabytes easily. YouвЂ™ll need to prep the USB stick first, so hereвЂ™s how youвЂ™re going to do it:Please note that before installing any system, you need to ensure there is sufficient space on your Mac.

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Did you know that, since Mavericks came out, you could make a bootable USB stick and boot from it if needed? Well, weвЂ™re going to show you how to do just that from MacOS. You may need to boot from a USB stick to fix an issue or reinstall MacOS. Maybe you just want a different flavor of MacOS other than your current version. Perhaps your MacвЂ™s system has run into some problems or isnвЂ™t working correctly. Next, youвЂ™ll reboot your computer with the USB stick inserted into an empty port and hold the вЂњOptionвЂќ key down on your keyboard as your Mac starts, and boot from the USB stick youвЂ™ve created. ItвЂ™s going to take a while to copy the MacOS to your USB stick, so patience is a virtue during this step.ДЄs long as everything has gone according to plan, you shouldвЂ™ve received a message in Terminal: вЂњCopy Complete.вЂќ Done.

In this example, weвЂ™re using the path to make a bootable USB image of El Capitan, just in case things go awry with the current installation of Sierra. Otherwise, call a friend who also owns a Mac and ask nicely to use theirs to make the bootable USB stick.Дepending on which version of MacOS youвЂ™re creating a USB stick for, the path varies. If your current OS installation is still functioning, you should be able to get there. Next, youвЂ™re going to head on over to the Mac App Store on a Mac laptop or computer. Now, click on the вЂњEraseвЂќ button and the Disk Utility will prepare the USB stick for the next steps youвЂ™re going to follow.Дisk Utility will let you know when itвЂ™s completed the task once itвЂ™s finished, close Disk Utility.

Leave the USB stick named as вЂњUntitled.вЂќ Make the format вЂњMac OS extended (Journaled)вЂќ and use вЂњGUID Partition MapвЂќ as your scheme.

Click on your USB stick, then select вЂњErase.вЂќ.

Once you open Disk Utility, youвЂ™ll see your USB drive listed. YouвЂ™ll have to prepare it by going to Applications > Utilities > Disk Utility. Make sure you have what you need from it, because youвЂ™re going to erase it and make it Mac compatible. Before you do anything with the USB stick, it must be 8GB in size or larger.