Yesterday night, as I was using my Mac, I got a pop-up warning saying that ‘Your storage is almost full‘. So I went on to clear my Trash can, downloads and some long-time-unused Apps. Eventually, I freed 18GB of my hard-drive space.

2 hours later, the same warning appeared again!

When I checked my Finder bottom bar, it showed that I am only left with 500MB!! If this was not scary enough, I watched the number decreasing from 500 to 498, 497, 496 …

I thought there must be some malicious programme trying to install a huge amount of stuff on my computer. But when I checked the Activity Network, the Data received/sec is only 4Kb, much less than the speed that my storage was filling up at. Nevertheless, a process name cloudd was taking up a substantial amount of CPU power.

I used the DaisyDisk app to help me check my storage.

Then I found the following stuff was taking up a HUGE amount of space (35GB):

/Users/[my username]/Library/Caches/CloudKit/com.apple.CloudDocs

That file was generated by the iCloud Drive cache activity. Hope that Apple will fix the serious bug soon.

Solution:

1. disable iCloud Drive through iCloud in System Preferences

2. delete the entire folder

/Users/[my username]/Library/Caches/CloudKit/com.apple.CloudDocs

 

P.S. You may also checkout the CleanMyMac app to identify and remove large redundant files from your system to make more space.