Copsy›Guides›Back up a RED card on Mac

How to back up a RED card on Mac (R3D, RED MINI-MAG & CFexpress)

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

Short answer

Copsy — a free Mac camera-offload app — is the simplest way to back up RED .R3D footage on a Mac. Drop a RED MINI-MAG or CFexpress card into its reader and Copsy auto-detects it as a RED source, copies the whole card to your drive and to Google Drive or Dropbox in parallel, verifies every file with ASC-MHL checksums, organizes it by date and source, and pings you on Telegram when it's done — free, no card limit, no signup.

RAW RED footage is some of the most expensive data on set. A verified offload, not a Finder drag, is what lets you wipe the card with confidence.

Download Copsy for Mac → · macOS 13+ · no account needed

What's actually on a RED card

RED cameras record their native raw format, .R3D, to dedicated media. On DSMC2-era bodies that's the RED MINI-MAG; newer bodies like KOMODO and V-RAPTOR record to CFexpress Type B cards. Either way, the camera writes clips alongside a folder-and-metadata structure that downstream tools (Resolve, Premiere, RED's own software) expect to find intact.

The practical takeaway for backup: copy the whole card, exactly as it sits. Cherry-picking individual clips out of their folders is how metadata, spanned clips, and the camera's structure get broken. We'll stay general on exact folder names here, since they vary by camera and firmware. The safe move is to copy the entire card byte-for-byte and verify it rather than hand-rebuild the layout.

Why verified offloads matter so much for RED RAW

RED footage is expensive in every sense: high data rates, large files, and a shoot you usually can't repeat. The danger isn't a copy that obviously fails. It's a copy that looks fine but isn't. A silent read error on the card, a half-written file, a flaky reader or cable, a USB hub that drops a packet: any of these can corrupt a clip while the Finder progress bar still slides cleanly to 100%.

You only find out later: in the edit, in the grade, or worst of all after the card has already been formatted and reused. Checksum verification closes that gap. Copsy reads each file, writes it to the destination, and then compares a checksum of both sides using the ASC-MHL standard, the same film-set and Netflix-delivery verification approach professional offload tools use. If a single byte is off, you know before the card is wiped.

The one rule for RED media on set

Never format a RED card until the copy is verified. Not "until it finished copying," but until a checksum confirms it.
Two copies before format. A drive copy plus a second destination (a second drive or the cloud) means a single bad disk doesn't end the day.
Copy the full card, not loose clips. Keep RED's folder and metadata structure intact.

How Copsy detects, copies and verifies a RED card

Plug in the card. Put the RED MINI-MAG or CFexpress card in its reader. Copsy detects it by content and recognizes it as a RED source — no menu-diving to tell it what camera you shot.
Pick destinations. An external drive, plus optionally Google Drive or Dropbox. Copsy copies to the drive and the cloud in parallel, so your backup and your off-site copy happen in one pass.
Copy the whole card. Copsy copies the complete .R3D media as it sits on the card and organizes it by date and source, so projects stay tidy without you renaming folders.
Verify with ASC-MHL. Every file is checksum-verified bit-for-bit. Nothing lost, nothing silently corrupted — and you have the MHL record to prove it.
Get pinged. A Telegram message tells you the card is done and verified, so you can pull it and load the next one without babysitting a progress bar.

Copsy vs a Finder drag for RED footage

Step	Copsy	Finder drag-and-drop
Price	FREE	Free (built in)
Auto-detects the RED card	✓	—
ASC-MHL checksum verification	✓ built-in	none
Copies to a drive AND cloud in parallel	✓	one at a time
Organizes by date + source	✓	manual
Tells you when it's safe to format	✓ verified	you guess
Telegram notification when done	✓	—

RED, R3D, RED MINI-MAG, KOMODO and V-RAPTOR are products of RED Digital Cinema; Copsy is not affiliated with or endorsed by RED. Card and format details were last verified in June 2026 — check RED's site for current specifics.

A safe RED offload routine that scales to a 3-2-1 backup

One verified copy is the floor, not the goal. The industry rule of thumb is 3-2-1: three copies of your footage, on two different kinds of media, with one off-site. Copsy gets you most of the way in a single offload. The drive copy is local, and a Google Drive or Dropbox copy made in the same pass is your off-site leg. Add a second drive later and you're fully covered. For RED RAW, that redundancy is cheap insurance against the one card you really can't afford to lose.

Frequently asked questions

How do I back up a RED .R3D card on a Mac?

Connect the RED MINI-MAG or CFexpress card to your Mac through its reader and open Copsy. Copsy auto-detects the RED card, copies the full card — the complete .R3D media — to an external drive and optionally to Google Drive or Dropbox in parallel, then verifies every file with ASC-MHL checksums so you know nothing was lost.

Why not just drag RED footage across in Finder?

A Finder drag copies the files but does not verify them, so a silent read error or a half-written file can slip through unnoticed on footage you can never reshoot. Copsy reads each file, writes it, then checksums both sides with ASC-MHL — a copy you can actually trust before the card gets wiped.

Should I copy the whole RED card or just the clips?

Copy the whole card. RED media keeps clips alongside the folder and metadata structure the camera wrote, so the safest backup is the entire card copied intact, exactly as it sits on the media. Copsy copies the full card and preserves that structure rather than cherry-picking individual files.

Which RED cards does Copsy work with?

Copsy detects RED cards by their content, so it works with RED MINI-MAG media from DSMC2-era cameras and CFexpress Type B cards used by newer RED bodies such as KOMODO and V-RAPTOR. As long as the card mounts on your Mac through its reader, Copsy can offload and verify it.

Can Copsy back up a RED card to a drive and the cloud at once?

Yes. Copsy can copy your .R3D footage to an external drive and to Google Drive or Dropbox in parallel during the same offload, so your local backup and your cloud copy happen together in one pass.

Is Copsy free for backing up RED footage?

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

Offload your next RED card for free

Copsy — a free Mac camera-offload app. Verified .R3D copies to a drive and the cloud, nothing lost.

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