Unaccounted occupied space after Mojave install
A friend has a MBPro with a 250GB SSD running the latest Mojave. Recently she got a message saying her hard drive was almost full, which made no sense. Last time I checked she had over 100GB free when she was still running High Sierra. Now it as less than 5GB free for seemingly no reason with the big change being that she upgraded to Mojave.
I ran OmniDiskSweeper with the sudo terminal command, but it shows basically what Finder shows. Her home folder is about 60GB, System=9GB, Library=6GB and Applications= 6GB. Not even 100GB should be occupied, yet About>Storage>Manage shows 245GB occupied, 170GB of with is System. I ran GrandPerspective which reports pretty much the same as OmniDiskSweeper...the occupied space just doesn't add up
Have emptied trash. Have restarted into SafeBoot. Have run DiskUtility from Recovery partition. The problem remains.
Is this a case where the transition to APFS just did not go well? And nuke and pave is the only option? Or is there some explanation?
I'm going to "Answer" this by posting it as better worded question.