Copsy›Back up an audio recorder card on Mac

How to back up an audio recorder card on Mac

Written by a working DIT · Copsy · Last verified June 2026

Short answer

Copsy — a free Mac camera-offload app — backs up production sound cards the same way it backs up video. Drop in the SD or CFexpress card from a Sound Devices, Zoom or Tascam field recorder and Copsy detects it as an audio source, copies the BWF/WAV files to your drive and to Google Drive or Dropbox in parallel, verifies every file with ASC-MHL checksums, and pings you on Telegram when it's done.

Sound is the one track you can never re-shoot in the edit. Verify it on offload instead of dragging it in Finder, and you can reformat the card knowing every take copied bit-for-bit.

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Production sound cards deserve the same care as picture

Field recorders from Sound Devices (the MixPre and Scorpio families), Zoom (the F and H series) and Tascam (the DR and Portacapture lines) record to SD/SDHC/SDXC cards — and the higher-end multitrack bodies to CFexpress as well. Most write broadcast-standard BWF (Broadcast Wave) files: ordinary WAV audio with extra metadata baked in. Scene, take, track names, notes and timecode travel inside the file as BWF and iXML metadata, which is exactly what lets the editor sync sound to picture later.

A sound card is small, which is the trap. It's tempting to just drag it to a drive in Finder and move on. But a small drag-and-drop copy can silently drop a file or flip a bit, and on a short WAV the damage may not surface until someone opens that exact take in the cut, long after the card was wiped and reused. Picture gets babied with verified offload tools. Sound too often gets a Finder drag, and it shouldn't.

What a verified audio offload actually protects

The only copy. Until it's backed up, the card holds the sole copy of your dialogue and synced takes.
The metadata. BWF/iXML scene, take and timecode info must arrive intact for the sync to work in post.
Silent corruption. A checksum catches a bad copy before you format the card. Finder will happily report a broken copy as "done."

How Copsy handles an audio card

Copsy detects cards by their content, not by a label you have to set. When it sees a card full of BWF/WAV takes laid out the way a field recorder writes them, it treats it as an audio source and runs the same four-step offload it uses for any camera card:

Insert the card. Plug the recorder's SD or CFexpress card into your Mac; Copsy recognizes it as an audio source.
Pick destinations. An external drive, plus optionally Google Drive or Dropbox — all copied in parallel.
Copy & verify. Copsy copies the whole card, organizes it by date and source, and verifies every file with ASC-MHL checksums. Your folders and embedded BWF/iXML metadata are preserved as-is — nothing is transcoded or rewritten.
Get pinged. A Telegram message confirms the sound card finished and verified, so you can reformat with confidence.

Sound and picture in one verified pass

On most jobs the sound card lands on the same cart as the camera cards. Because Copsy auto-detects each card's source, you can run a Sound Devices card and a Sony, ARRI, RED, Blackmagic, Canon or drone card through the same workflow and have both organized by date and source on the same drive. One offload routine covers both departments, both checksum-verified.

That parallel copy to Google Drive or Dropbox matters most for audio: a single sound card represents a whole day of dialogue, and a cloud copy made during the offload means an off-site backup exists before the drive even leaves set. That gets you a real 3-2-1 backup on the sound files without a second manual step.

Copsy for audio offload at a glance

Task	Copsy	Finder drag-and-drop
Price	FREE	FREE
Detects a field-recorder card as an audio source	✓	—
Verifies every BWF/WAV with ASC-MHL checksums	✓	no verification
Preserves folders + BWF/iXML metadata	✓	✓ (if copy succeeds)
Copies to a drive AND cloud in parallel	✓	—
Organizes by date + source	✓	manual
Telegram notification when done	✓	—
Catches a corrupt copy before you reformat	✓	✗

Specific recorder models, media types and folder layouts vary by device and firmware — details above were last verified in June 2026. Copsy treats any card as a verified copy job; check your recorder's manual for its exact file structure.

A few honest caveats

Good to know

Copsy verifies and backs up — it does not rename, re-clock or rewrite BWF metadata. Use your sound-report tool for that; Copsy's job is getting the files copied and proven intact.
It's macOS 13+ only for now. If you offload on Windows, this isn't your tool yet.
Copsy copies what's on the card. It can't recover takes the recorder never finished writing, so always stop recording cleanly before ejecting.

Frequently asked questions

Can Copsy back up a field recorder card, not just a camera card?

Yes. Copsy detects cards by their content, so an SD or CFexpress card from a Sound Devices, Zoom or Tascam recorder is recognized as an audio source. It copies the BWF/WAV files to an external drive and optionally to Google Drive or Dropbox, and verifies every file with ASC-MHL checksums — the same workflow it uses for video cards.

Why does a sound card need verified offload like video does?

A production sound card holds the only copy of your dialogue and timecode-synced takes until it's backed up. A dragged Finder copy can drop or corrupt a file silently, and on a small WAV that may not be obvious until the edit. Verifying every file with a checksum proves each take copied bit-for-bit, so you can reformat the card with confidence.

Does Copsy keep the recorder's folder structure and metadata?

Yes. Copsy copies the card's contents as they are, so the recorder's folders and the BWF/iXML metadata embedded in each WAV — scene, take, track names and timecode — are preserved exactly. It does not transcode or rewrite your audio files.

Can Copsy offload sound and picture cards in the same session?

Yes. Copsy auto-detects the source of each card, so you can run an audio recorder card and a camera card through the same verified offload workflow and organize both by date and source. Sound and picture both end up backed up and checked.

Does verifying audio files slow the offload down a lot?

Not much. Production sound cards are usually far smaller than video cards, so the checksum verification pass on a card of WAV files is quick. The time you spend is tiny next to the cost of discovering a corrupt take after you've wiped the card.

Is Copsy free to back up audio cards?

Yes, Copsy is free to download and use today, with no card limit and no account required. It runs on macOS 13 or later and handles audio recorder cards alongside video cards.

Offload your sound card with proof it copied

Copsy — a free Mac camera-offload app. Verified BWF/WAV copies to a drive and the cloud, nothing lost.

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