upgrade of iCloud Drive storage on Mac running 10.13.6
Can I upgrade my iCloud Drive storage from 50 to 200 gigs in Mac running 10.13.6. My Mac system is upgrade as high as I can go.
iMac 21.5″, macOS 10.13
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iCloud Drive storage is completely independent of the internal storage of your system, or the OS you're running. You can upgrade iCloud Drive to as much as 2TB, if you need it.
iCloud+ plans and pricing - Apple Support
Just be aware that having 2TB of storage on iCloud doesn't automatically give you more space on your internal system. You can use the space to offload idle data and apps to iCloud to free up some space, but don't think that upgrading iCloud Storage directly affects your local system.