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I've encountered a problem on my brand new MacBook, but haven't been able to find a solution after working on it for most of today. In a nutshell: When I go to 'About This Mac Storage' the System files were taking up a whopping 90+ GB of my hard drive.

Optimized Storage in macOS Sierra and later* can save space by storing your content in iCloud and making it available on demand. When storage space is needed, files, photos, films, email attachments and other files that you seldom use are stored in iCloud automatically. Each file stays right where you last saved it, and downloads when you open it. Files that you’ve used recently remain on your Mac, along with optimised versions of your photos.

* If you haven't yet upgraded to macOS Sierra or later, learn about other ways to free up storage space.

Find out how much storage is available on your Mac

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Jul 22, 2015 4 Easy Steps to Delete 'Other' Space and Speed Up Your Mac. Reduce and delete the 'other' section on your Mac and free up hard drive space.-. How To Clean A Mac.
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Choose Apple menu  > About This Mac, then click Storage. This is an overview of available storage space on your Mac, as well as the space used by different categories of files:

Click the Manage button to open the Storage Management window, pictured below. (The Manage button is available only in macOS Sierra or later.)

Manage storage on your Mac

The Storage Management window offers recommendations for optimising your storage. If some recommendations are already turned on, you will see fewer recommendations.

Import imove library to new mac.

Store in iCloud

Click the Store in iCloud button, then choose from these options:

Desktop and Documents. Store all files from these two locations in iCloud Drive. When storage space is needed, only the files you recently opened are kept on your Mac, so that you can easily work offline. Files stored only in iCloud show a download icon , which you can double-click to download the original file. Learn more about this feature.
Photos. Store all original, full-resolution photos and videos in iCloud Photos. When storage space is needed, only space-saving (optimised) versions of photos are kept on your Mac. To download the original photo or video, just open it.
Messages. Store all messages and attachments in iCloud. When storage space is needed, only the messages and attachments you recently opened are kept on your Mac. Learn more about Messages in iCloud.

Storing files in iCloud uses the storage space in your iCloud storage plan. If you reach or exceed your iCloud storage limit, you can either buy more iCloud storage or make more iCloud storage available. iCloud storage starts at 50GB for $0.99 (USD) a month, and you can purchase additional storage directly from your Apple device. Learn more about prices in your region.

Optimise Storage

Click the Optimise button, then choose from these options.

Automatically remove watched films and TV shows. When storage space is needed, films or TV shows that you purchased from the iTunes Store and already watched are removed from your Mac. Click the download icon next to a film or TV show to download it again.
Download only recent attachments. Mail automatically downloads only the attachments that you recently received. You can manually download any attachments at any time by opening the email or attachment, or saving the attachment to your Mac.
Don't automatically download attachments. Mail downloads an attachment only when you open the email or attachment, or save the attachment to your Mac.

Optimising storage for films, TV shows and email attachments doesn't require iCloud storage space.

Empty Trash Automatically

Empty Trash Automatically permanently deletes files that have been in the Trash for more than 30 days.

Reduce Clutter

Reduce Clutter helps you to identify large files and files you might no longer need. Click the Review Files button, then choose any of the file categories in the sidebar, such as Applications, Documents, Music Creation or Trash.

You can delete the files in some categories directly from this window. Other categories show the total storage space used by the files in each app. You can then open the app and decide whether to delete files from within it.

Learn how to redownload apps, music, films, TV shows and books.

Where to find the settings for each feature

The button for each recommendation in the Storage Management window affects one or more settings in other apps. You can also control those settings directly within each app.

If you're using macOS Catalina, choose Apple menu  > System Preferences, click Apple ID, then select iCloud in the sidebar: Store in iCloud turns on the Optimise Mac Storage setting on the right. Then click Options next to iCloud Drive: Store in iCloud turns on the Desktop & Documents Folders setting. To turn off iCloud Drive entirely, deselect iCloud Drive.
In macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud, then click Options next to iCloud Drive. Store in iCloud turns on the Desktop & Documents Folders and Optimise Mac Storage settings.
In Photos, choose Photos > Preferences, then click iCloud. Store in iCloud selects iCloud Photos and Optimise Mac Storage.
In Messages, choose Messages > Preferences, then click iMessage. Store in iCloud selects Enable Messages in iCloud.

If you're using macOS Catalina, open the Apple TV app, choose TV > Preferences from the menu bar, then click Files. Optimise Storage selects “Automatically delete watched films and TV shows”.
In macOS Mojave or earlier, open iTunes, choose iTunes > Preferences from the menu bar, then click Advanced. Optimise Storage selects “Automatically delete watched films and TV shows”.
In Mail, choose Mail > Preferences from the menu bar, then click Accounts. In the Account Information section on the right, Optimise Storage sets the Download Attachments menu to either Recent or None.

Empty Trash Automatically: From the Finder, choose Finder > Preferences, then click Advanced. Empty Trash Automatically selects “Remove items from the Trash after 30 days”.

Other ways that macOS helps automatically save space

With macOS Sierra or later, your Mac automatically takes these additional steps to save storage space:

Detects duplicate downloads in Safari, keeping only the most recent version of the download
Reminds you to delete used app installers
Removes old fonts, languages and dictionaries that aren't being used
Clears caches, logs and other unnecessary data when storage space is needed

How to free up storage space manually

Even without using the Optimised Storage features of Sierra or later, you can take other steps to make more storage space available:

Music, films and other media can use a lot of storage space. Learn how to delete music, films and TV shows from your device.
Delete other files that you no longer need by moving them to the Trash, then emptying the Trash. The Downloads folder is good place to look for files that you might no longer need.
Move files to an external storage device.
Compress files.
Delete unneeded email: In the Mail app, choose Mailbox > Erase Junk M

Mac Hard Drive Space Library Containers