Two numbers, never merged
What something occupies and what deleting it frees right now sit side by side, always. If anything is holding that space, Quarry names it.
The cleaner said there were 12 GB sitting there. You deleted them. Free space didn't move. The tool wasn't lying to you — the number it printed was never the number you could get back.
Nine spare checkouts on one machine
Local snapshots are holding the other 12 GB. It returns on its own once they expire — and until then, deleting anything gets you nothing.
What something occupies and what deleting it frees right now sit side by side, always. If anything is holding that space, Quarry names it.
Build output regenerates. What you wrote does not. Quarry says which is which, one item at a time, and what that judgement rests on.
If there is uncommitted work, that tool refuses — and the refusal is the safety. Quarry never forces past it.
Anything it could not fully read, cannot attribute, or that another process is using stays exactly as it is, and off the list.
This becomes a download link once it ships. Requires macOS 15 or later.