My Mac was 97% full. I deleted fifteen gigabytes
and ended up with less space than I started with.
Ninety-seven percent full. Below twenty gigabytes macOS starts to quietly degrade, so this had stopped being housekeeping and become a health problem.
I did what you do. Cleared fifteen gigabytes of cache — npm, Docker, the usual archaeology of a machine that builds things. Then I checked the number.
Twelve gigabytes free. It had gone down.
Every hour, macOS quietly photographs itself. A snapshot's whole job is to remember — and that includes remembering every file you just threw away. I was carrying boxes out of a house while someone at the door insisted the boxes were still inside. Nothing I deleted was gone. The disk was pinned by its own memory.
That was the first one. There were two more.
I keep a Setapp subscription. If I'm honest, I keep it mostly for one app: the one that cleans my Mac. I have been paying, every month, for years, for a button that deletes caches.
Sit with the incentives for a second. The cleaner app, the bigger iCloud tier, the external drive, the second drive for the first drive — every company in that chain is paid to tell you the same story. You need more space.
Not one of them is paid to ask the question that actually mattered. There's no subscription in it.
Two video files, five and six gigabytes, client session masters. I decided to move them to my portable drive. The responsible thing. Off the machine, onto a disk, done.
The drive wouldn't take them. Formatted FAT32 — a filesystem older than most of my clients' companies, which physically cannot hold a file over four gigabytes. So there I was, mildly annoyed at a USB stick, planning a reformat.
And Claude asked the question. Not how do we reformat the drive.
They were. Both of them. Byte for byte identical, uploaded the same day I recorded them, sitting in an account I pay for and had completely forgotten I'd used. The premise of the whole operation — that these were my only copies — had been false for a year.
So we asked it of every large file on the machine. Eleven times the answer came back yes. Sixteen gigabytes freed. Nothing plugged in, nothing reformatted, nothing moved.
The archive instinct is old and it wears the costume of virtue. Boxes to the attic. Papers to the storage unit. Files to the drive in the drawer. It feels like solving. It is moving.
And it has a cost nobody mentions: a drive in a drawer has no redundancy, no versioning, and fails silently. Moving those masters onto that USB stick would have made them less safe than leaving them exactly where they sat.
I had designed the entire archive system before any of this. Manifest schema, drives identified by volume ID instead of name, categorical splits so you'd know which disk to grab. It was good work. It never ran.
What got me there wasn't a tool. It was a structure I run before any real work now — Context, Role, Interview, Task. The interview step is the whole trick: the machine has to ask me questions before it does anything.
That's the difference between an assistant that executes my bad plan very efficiently, and a partner that notices my plan rests on something I never checked. I asked for help moving files. I got asked whether the files needed moving.
The other half was being wired in. Claude could see my Google Drive. Without that, "do you already have this?" is a rhetorical question. With it, it's a lookup — and it beat every tool I own.
Buying the cleaner is easy. It'll get you a few gigabytes and a pleasant feeling of tidiness. The harder and much cheaper move is to get something wired into what you already own, and let it ask the unglamorous question before you spend a dollar.
Do you already have this?
I wrote the whole procedure down — every step in order of payoff, plus how to catch all three liars before they waste your afternoon. Take it, run it on your own machine.