MasterCopy: Verified Offload
Hash-checked media backup
Only for Mac
Free · In‑App Purchases
Mac
Footage and beyond: every file verified one by one with xxHash, from copy to MHL report in three steps. Buy once, it's yours. No monthly fees. Launch price, now only.
Every file offloaded. Every file verified.
MasterCopy offloads footage, photos, audio, and any production data from camera media to your drives — then reads back every file from the destination disk and checks it with xxHash. If a single byte is off, you'll know before the cards are wiped.
Born on set, where a reshoot is never an option — and just as useful for photographers, sound designers, 3D artists, or anyone whose files can't be recreated.
VERIFIED OFFLOAD After the transfer, each file is re-read from disk — bypassing the OS cache — and its hash is compared to the source. Silent corruption doesn't slip through.
SAFE BY DESIGN Originals are never deleted, moved, or renamed. Each file is written to a temporary name first, then committed atomically — so even a sudden disconnect won't leave a half-written file at the destination. If verification finds a mismatch, the file is quarantined with a guide on what to do next.
INCREMENTAL & RESUMABLE Re-insert the same media and only what's missing is offloaded. Existing files are checked against the transfer ledger, so known-good files are skipped instantly. Disconnected mid-transfer? Resume from where you left off — already-verified files aren't re-copied.
MHL REPORTS Generates ASC MHL v2.0–compatible logs automatically after every transfer. Use them to prove what was offloaded, when, and that it matched the source.
RE-VERIFY ANYTIME Days later, wondering if the drive is still intact? Run a verify-only pass — no copying, just a full hash check of what's already there.
THREE STEPS Drop your source media. Pick a destination. Press START. Verification runs automatically after the offload, and a notification lets you know when it's done.
A one-time purchase. No subscription, no ads.
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v0.9.3
Thank you for using MasterCopy. This update brings small refinements — bit by bit, we're improving everyday usability and reliability. As always, we're committed to quality, and we'll keep refining every detail.
The developer, Takayuki Aoki, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- alps.tokyo
- Size
- 4 MB
- Category
- Productivity
- Compatibility
Requires macOS 14.0 or later.
- Mac
Requires macOS 14.0 or later.
- Mac
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Unlimited Copy $29.99
- Copyright
- © alps.tokyo