We have 6 Mac Pros that are running as Jenkins build machines. All of the machines end up accumulating large quantities of data build up we can't locate or get rid of. It shows as "System files" taking up over 350GB. When we used 3rd pary applications like Daisy Disk to find out where the files were coming from they are only listed as "Hidden files" taking up 350GB but can not find where this files actually are. The machines are running high sierra and are using the latest version of Xcode. Has anyone encountered something like this before and found a fix for this strange buildup?