How to Duplicate a Hard Drive on Mac | Full 2026 Walkthrough

Cloning a Mac drive requires a source and destination drive, then using software like SuperDuper!, Carbon Copy Cloner, or the built-in Disk Utility.

Duplicating a hard drive on a Mac—also called cloning—creates an exact, bootable copy of everything: apps, settings, and files. It’s the standard path for upgrading to a larger drive, migrating to a new machine, or creating a backup that can run your Mac in an emergency.

There are three proven ways to do it: Apple’s built-in Disk Utility, or the dedicated apps SuperDuper! and Carbon Copy Cloner. Each works slightly differently, and each has a specific use case. Here’s the step-by-step, including the hardware you need and how to verify the clone actually boots.

Duplicating a Mac Drive: The Step Order That Works

A duplicate—or clone—is a 1:1 copy of your source drive. Unlike a standard Time Machine backup, a clone is bootable. If your internal drive fails, you plug the clone in and keep working. The destination drive is erased during the process, so move any important files off it first.

Prerequisites: What You Need Before You Start

Two drives connected to the same Mac: the source (your internal drive) and the destination (an external drive). The target drive will be formatted and overwritten, so nothing important should live on it.

Format the destination. Open Disk Utility from /Applications/Utilities/. Select the external drive in the sidebar, click Erase, and choose a format. APFS is the standard for SSDs and modern macOS. Mac OS Extended (Journaled) works for HDDs or older Macs.

Grant Full Disk Access. SuperDuper! and Carbon Copy Cloner need this permission to read the source drive fully. Go to System Settings > Privacy & Security > Full Disk Access. Unlock the lock, check the app’s box, and relaunch the app.

Time. A full clone takes anywhere from 20 minutes to several hours, depending on the data size and connection speed (USB-C is significantly faster than USB-A).

Method 1: Disk Utility Restore (Built-in, Free)

This is Apple’s official tool. It’s free, lives on every Mac, and works reliably for a one-time clone. The tradeoff is it erases the destination completely, and it’s less flexible than the paid apps.

1. Open Disk Utility from /Applications/Utilities/.
2. Select your destination volume in the sidebar.
3. Click Restore in the toolbar.
4. Set the Restore from dropdown to your source drive.
5. Click Restore and confirm the operation.

Disk Utility will format the target drive, then copy every byte of data from the source. When the progress bar finishes, you have a clone.

Method 2: SuperDuper! (Simple, Reliable)

SuperDuper! from Shirt Pocket is the most straightforward third-party cloning app. CNET’s Mac cloning guide highlights it as a favorite for quick, full copies.

1. Install SuperDuper! and grant Full Disk Access as described above.
2. In the main window, choose the source drive in the Copy menu.
3. Choose the target drive in the to menu.
4. Set the using dropdown to Backup – all files.
5. Click Copy Now.

The app will erase the target, copy the source, and make the clone bootable. Once finished, verify the clone before depending on it.

Method 3: Carbon Copy Cloner (Advanced, Automated)

Carbon Copy Cloner (CCC) from Bombich is the most feature-rich option. It supports bootable backups, automated schedules, snapshot management, and selective restores.

1. Install CCC and grant Full Disk Access.
2. Select the source drive at the top.
3. Select the destination drive.
4. CCC will detect your intent and offer to create a bootable backup. Accept.
5. Click Start to begin the clone.

On newer macOS versions and Apple Silicon Macs, bootable clones have stricter requirements. CCC includes a Legacy bootable copy assistant for compatibility, and Bombich maintains a detailed compatibility guide on their site. Check the current release notes before running the first backup.

Can I Just Use Drag and Drop?

No. Drag-and-drop does not copy system files, permissions, or the hidden directories that make an operating system bootable. You must use cloning software or Disk Utility to create a functional duplicate.

How Do I Boot From the Clone?

Verifying the clone is the only way to confirm it works. Shut down the Mac, connect the cloned drive, and power on.

• Intel Macs: Hold the Option (⌥) key immediately after the startup chime. The Startup Manager appears. Select the cloned drive with the arrow keys and press Return.
• Apple Silicon (M1, M2, M3, M4): Press and hold the power button until Loading startup options appears. Select the cloned drive and click Continue.

If the Mac boots to your desktop with all apps, files, and settings intact, the clone is verified and ready to use as a backup or replacement drive.

Final Checklist Before You Clone

1. Connect both drives to the Mac.
2. Format the destination drive (APFS or macOS Extended).
3. Grant Full Disk Access to third-party cloning apps.
4. Run the clone using Disk Utility, SuperDuper!, or Carbon Copy Cloner.
5. Verify the clone by booting from it.

That’s the full process. You now have a duplicate, bootable copy of your Mac’s hard drive, ready for backup, migration, or emergency use.