It was notorious for its crashes and reporting discrepancies, but now it’s incorporated in System Settings it’s more reliable and helpful. But there’s still the problem of System Data.
Grand Perspective
What do you do when you discover your Mac’s Data volume has run out of free space? A guide to working with snapshots, iCloud Drive, and other tricks to salvage your Mac. And how to prevent this from happening again.
228.7 GB of my internal disk is occupied by ‘Other’. Where has this gone, and how can I reclaim it?
The Eclectic Light Company 