If you are like me and keep your system drive (C:) at a minimum and only use it for apps and programs, not as your actual storage drive. Then having iCloud Drive filling up your system drive because, well Apple don't let you decide where to store your synced files. Thins generally means that if you are syncing your iCloud Drive with gigs and gigs of terabyte, your system drive will fill up pretty fast.
I found this very easy fix to trick your iCloud Drive into syncing into any folder of your choice. I won't be copy pasting so for those that can't figure out this simplified guide, head over to the original post, link in the bottom.
Basically follow these steps:
Click the iCloud icon on the system tray, and then click Open iCloud Settings to bring up the iCloud app.
Uncheck the box next to iCloud Drive, and then click Apply.
Click Delete From PC on the confirmation box. This will delete all downloaded iCloud Drive files and folders from your computer. Exit the iCloud app afterward. Don't worry, nothing will be deleted from your actual iDrive, only the synced file on your hard-drive, which is what we want anyway.
Create a new folder within the partition or external drive where you want to change the iCloud Drive storage location to. You can insert any name. For example, I created a folder on my D drive simply called "iCloud Drive".
Right-click the Start menu icon, and then click Windows PowerShell on the context menu.
Make the necessary adjustments to the command below, and then type it into the Windows PowerShell console: Replace username with your actual Windows username, Replace D:\iCloud\iCloud Drive with the actual file path of the new iCloud Drive storage location.
cmd /c mklink /J “C:\Users\username\iCloudDrive” “D:\iCloud Drive”
Press Enter to execute the command. You should see a "Junction created for..." message as confirmation.
Relaunch the iCloud app via the system tray, and then re-enable iCloud Drive (check the box next to iCloud Drive, and then click Apply).
Now your iCloud Drive files will sync to that folder and keep your system drive from filling up, and all your synced files will also stay put if you need to reinstall Windows or if anything happens. Just remember to do this trick again if you need to reinstall.
For the fancy guide with images and longer descriptions, go to: