It's especially important that you check any hardware drivers for compatibility. For example, if you use a RAID storage device, and its driver isn't updated, you won't be able to access your files on that device, and if you have a graphics card whose drivers are not part of macOS, you'll need to make sure they have been updated to use your Mac correctly.
You may notice—and you may already have—that some apps, when launched, engender a dialog saying that they are not optimized for your Mac. These apps run in bit mode, and Apple is soon requiring that all apps be bit.
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It's up to the developers to update the apps, and, in some cases, this won't be done, so be prepared to find replacements for some older apps next year. It's a good idea to update as much of your software as possible before upgrading to Mojave. Most apps these days offer updates automatically, or, if you've purchased them from the Mac App Store, via the App Store app. Don't worry about small apps being updated, but for things like Microsoft Office, or Adobe's Creative Cloud apps, and other apps you depend on for your work, it's a good idea to check for updates before upgrading to ensure that you won't have any issues.
Another thing you can do is clean out some of the gunk that has been on your Mac for a while. You can also use Intego Washing Machine to clean up and delete files you no longer need, such as cache files, downloads, duplicates, and more. Before upgrading, it's a good idea to run Disk Utility's First Aid tool on your startup volume, as well as on the disk s you will use to back up your Mac see below. Launch Disk Utility, select your startup volume, then click First Aid in the toolbar. This will take a few minutes, and during the process your disk will be locked so Disk Utility can make repairs, if necessary.
When this is completed, it will tell you if all is well, and if it has made repairs. If your Mac is compatible, and you're ready to upgrade, the first thing you should do is back up your Mac.
You can use Time Machine if you have an external hard drive, but the safest way to do this is to clone your drive. A clone, or bootable backup, is an exact copy of everything on your Mac's drive: system files and personal data. You can do this with Intego Personal Backup. If anything goes wrong during the upgrade process, you can boot from the external drive, and, if necessary, recopy all its files to your Mac.
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There are two ways to upgrade a Mac. The simplest is to run the macOS Mojave installer, which will install the new files over your existing operating system. It won't alter your data, but only those files that are part of the system, as well as bundled Apple apps. The other is to use Apple's Migration Assistant. This app is designed to move your data from an old Mac to a new one, but you can also use it for an upgrade.
To do this, you should clone your Mac, on at least two drives one to use for the upgrade, and another as a backup. Start up your Mac, then press the Option key immediately so you can select that drive as the startup drive. You did make two backups, right? Download the macOS Mojave installer and launch it.
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It will ask which drive you want to install the software on; select the now erased drive in your Mac. Follow the instructions to complete the installation. When you've finished, you'll have a virgin operating system on your Mac, and you'll still be working from your external drive. You can now copy all the files in your home folder, as well as personal apps.
A clean installation is time consuming, but it can weed out old files from apps you no longer use, and it's a good way to start with a clean slate. Some people do this for every major operating system upgrade; I only do it every few years, because it does take a long time. If you do a clean installation, make sure to keep both of your clones for some time, just in case there's something you forgot to cop over. Okay, it's taken a while, but now you're ready. If you're installing macOS Mojave on a laptop, make sure it's charged, or connect it to a power supply; you don't want it running out of battery during the installation process.
Go to the Mac App Store and download the Mojave installer. This is about GB, and may take some time depending on your bandwidth. When the download is complete, the installer will launch; follow its instructions. The upgrade process can take a while - a half hour or so - and this is a good time to get a cup of tea or coffee, walk the dog, or do something else instead of sitting in front of your Mac watching its progress bar.
But first In general, after macOS is installed, the installer is deleted. It's a good idea to copy it to another location, an external drive, or, perhaps, your Downloads folder. This way you'll have another copy in case something goes wrong and you need to run it again. If your bandwidth is fast enough, this may not be necessary, but for many people it can save a lot of time to keep the installer safe. This is also useful if you have more than one Mac; you can just copy the installer to another Mac and run it.
Once the installation is completed, you'll need to go through a few screens, such as one to sign into your iCloud account. At this point, you may see an Incompatible Software screen telling you of apps that have been moved because they are known to be incompatible. You'll find them in an Incompatible Software folder at the top level of your drive.
But you can install the later version as well, and you have to check out whether your Mac can run the new version of Mac operating system or not. To see the compatibility of macOS with your computer, you must know about your Mac model and year. To find the model of your Mac, on the top-left corner of the screen, click the Apple menu and then select About this Mac option.
Other general requirements for macOS Is my Mac compatible with macOS Sierra If you see it in the list below then you can run macOS Sierra, otherwise, its time to upgrade the hardware. First of all when to try to boot your Mac from a hard drive or a Backup and this macOS version is incompatible then you will see any of the following signs.