Mac's hard drive is filling itself

I found what was actually filling up my disk.

/System/Library/Caches/com.apple.coresymbolicationd/ 

was 90G and growing.

I used DaisyDisk and analysed the disk in Administrator Mode (OmniDiskSweeper wasn't showing admin files).

I found on the internet that a lot of people had the same troubles.

Just open up a terminal and execute.

sudo rm -rf /System/Library/Caches/com.apple.coresymbolicationd/ 

For me it was a lot of old xcode app archives and device support for previous iOS versions.

I used DevCleaner for Xcode to free up a ton of space.

The app is free and was simple to use. I'm not affiliated in any way.