That is when cleanup stops feeling like housekeeping and starts feeling dangerous. One copy came from a promo pool, one still powers an old crate, one lives on the archive SSD, and the wrong delete can break the file your DJ library still trusts.
DJ Duplicate Cleaner is built for that exact mess. It scans the folders you choose, surfaces duplicate groups and broken DJ-library paths, and lets you keep the version you actually play before cleanup happens.
This preview is cut from a real screen recording of the macOS app. The page shows the actual workflow: scan roots, duplicate review, keeper choice, and cleanup history.
Real app capture on macOS. Not a mockup. Not a slide deck.
A generic duplicate cleaner sees spare files. A DJ sees intros, edits, cue-ready copies, archive drives, and library paths that fail at the worst possible time.
Promo folders, downloads, and last-minute edits keep multiplying. The names drift, the folders drift, and the duplicate group stops looking obvious.
Failure mode: the wrong copy survives because the tool never understood the context.
Good copies reappear from archived storage, stale copies stay in the main folder, and it stops being obvious which path your DJ software should keep trusting.
Failure mode: the cleanup run removes the copy with the better tags, artwork, or active path.
Serato, VirtualDJ, and old library history can keep pointing at paths that died months ago. You only notice when the track is needed.
Failure mode: duplicates look cleaned up, but the playable file is gone.
The point is not to race through deletion. The point is to see the dangerous parts early enough to make a good call.
Main music folders, DJ database locations, and archive drives stay explicit. Missing access is surfaced before it poisons the scan.
Duplicate groups, source folders, and keeper logic stay in front of you so the copy that survives is the one you actually want to play.
Cleanup history makes it obvious which runs were archive-safe, which ones were reversed, and which ones had no rollback path.
The workflow stays narrow on purpose: choose the scan roots, review the duplicate groups, keep the right file, and leave yourself a path back.
Point the app at the music folders, DJ library locations, and archive drives that actually matter instead of letting it wander through the whole disk.
See duplicate groups, possible savings, and missing-path clues before you touch cleanup.
Make sure the file that survives is the one with the path, metadata, and DJ-library value you actually want.
Archive-safe runs and rollback-ready history are part of the job, not an afterthought buried after cleanup.
Apple handles the sale. Ni Biashara handles the support. The current app does not require a Ni Biashara account.
The app is sold as a one-time Mac App Store purchase and runs as a local utility on your machine.
The public product surface matches the support and privacy pages used for the Mac App Store listing.