How to Clone Your Mac's Drive (Carbon Copy Cloner, SuperDuper, and Disk Utility)

You’ve heard “clone your Mac’s drive” as backup advice for years. The idea is simple: an exact copy of your boot disk, ready to run if the original dies. The reality on modern Macs is messier than it used to be, especially on Apple Silicon.

Here’s how cloning actually works in 2026, which tools deliver, and what they can’t do anymore.

What “cloning” actually means now

On older Intel Macs, a clone was a bit-for-bit copy of your boot drive that you could plug in and boot from. That worked because the boot system was simple and the drives were standard.

Apple Silicon changed the picture. The boot system is signed, integrated with Secure Boot, and tied to a sealed system volume. You can copy your data drive, but you can’t make a fully bootable clone the way you used to. To boot from external storage on M-series Macs, you have to install macOS onto the external drive separately, then sync your data over.

Three things to clarify:

1. Data clone — copying all your files, settings, applications, and Library folder. This still works perfectly. It’s what you actually need 95% of the time.
2. Bootable clone — a drive you can boot from in an emergency. On Apple Silicon, this requires installing macOS on the destination yourself before cloning data over.
3. Disk image / dmg — a single-file copy of the drive. Useful for archival, not for restoration.

If your goal is “I want a copy of my data so I can restore quickly to a new Mac or after a reinstall,” any tool here works. If your goal is “I want to plug in a drive and boot my Mac from it instantly,” that’s harder and worth less than it used to be.

Carbon Copy Cloner: the most flexible option

Carbon Copy Cloner (CCC) from Bombich Software is the standard. $40 single license, free 30-day trial. It supports APFS, scheduled tasks, file-level versioning via SafetyNet, and clear documentation about what works on Apple Silicon.

To clone with CCC:

1. Download from bombich.com.
2. Connect your destination drive (formatted APFS, GUID Partition Map).
3. Open CCC, drag your boot drive to Source and the external to Destination.
4. Click Start.

The first clone takes 1-4 hours depending on drive size and connection speed. Subsequent clones to the same destination are incremental — only changes get copied — and finish in minutes.

CCC’s killer feature is SafetyNet. By default, when CCC overwrites the destination, deleted files don’t actually disappear — they go into a _CCC SafetyNet folder, which retains them for 30+ days. This means a clone is also versioned in a limited way. You can recover a file you deleted last week from the clone.

For Apple Silicon bootability, CCC’s docs walk you through the dance: install macOS on the destination, then use CCC to sync data. It’s a lot of steps. Most people skip the bootability part.

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SuperDuper: the simpler option

SuperDuper from Shirt Pocket Software is older and simpler. The free version does full clones; the $28 paid version adds Smart Update (incremental) and scheduling.

To clone with SuperDuper:

1. Download from shirt-pocket.com.
2. Open SuperDuper.
3. Choose Source (boot drive), Destination (external).
4. Pick Backup - all files in the script dropdown.
5. Pick Erase, then copy files of for first run, or Smart Update for subsequent runs.
6. Click Copy Now.

SuperDuper has the same Apple Silicon limitations as CCC. The data clone works. The bootable part requires a fresh macOS install on the destination first.

The interface is dated — it looks like it’s from 2010 — but the tool is rock-solid. If you want one big “Clone” button and don’t need fancy versioning, SuperDuper is the right pick.

Disk Utility: free, basic, sometimes broken

Disk Utility ships with macOS and includes a Restore feature that can copy one disk to another. To use it:

1. Open Applications → Utilities → Disk Utility.
2. From the View menu, choose Show All Devices.
3. Select the destination drive.
4. Click Restore in the toolbar.
5. Choose your source drive from the dropdown.
6. Click Restore.

The advantage: free, ships with the OS. The disadvantage: it has zero versioning, no scheduling, often fails on APFS volumes with snapshots, and requires both source and destination to be unmounted/inactive (which means you have to boot from Recovery to clone your boot drive).

For non-boot drives (cloning a backup drive to a new larger backup drive, for example), Disk Utility’s Restore works fine. For boot drives on Apple Silicon, it almost never produces a bootable result.

Use Disk Utility for backup drive duplication. Use CCC or SuperDuper for actual data backups.

The bootable clone reality on Apple Silicon

Apple’s official position: bootable clones are no longer a supported workflow on M-series Macs. Bombich’s documentation is more pragmatic — they explain what works, what doesn’t, and what’s currently broken in any given macOS version.

To make a “bootable” clone on Apple Silicon today:

1. Erase the destination drive in Disk Utility. Format APFS, GUID Partition Map.
2. Boot into macOS Recovery (hold power on Apple Silicon, click Options → Continue).
3. From the macOS Installer, choose Reinstall macOS and pick the external drive as the destination.
4. Wait 30-60 minutes for the install.
5. Boot from the external drive (System Settings → General → Startup Disk, or hold power at boot).
6. Run through Setup Assistant to a temporary user account on the external.
7. Reboot to your normal Mac.
8. Use CCC to clone your data over to the external.

That works, but it’s a 2-3 hour project. And the next major macOS update may break the bootable state, requiring you to redo it.

The honest advice: don’t bother with bootable clones on Apple Silicon. A current data clone plus Internet Recovery for OS reinstall covers the same ground with less hassle.

Restoring from a clone

A clone is only as useful as your ability to restore from it. Two scenarios:

Scenario 1: Your Mac is broken, you have a replacement.

1. Set up the new Mac through Setup Assistant.
2. At “Migration Assistant” prompt, choose From a Mac, Time Machine backup, or Startup disk.
3. Connect your clone drive.
4. Pick the clone as the source and select what to migrate.
5. Wait an hour or so.

This is the path of least resistance. Migration Assistant treats a CCC clone like a Time Machine backup and pulls in users, apps, and settings.

Scenario 2: You’re restoring to the same Mac after a wipe.

1. Boot to Recovery.
2. Erase the boot drive, reinstall macOS.
3. Run Migration Assistant during Setup Assistant (or later from Applications → Utilities).
4. Point it at the clone drive.

Same flow. Migration Assistant doesn’t care whether it’s a new or old Mac.

What clones miss

A clone is a snapshot in time. If you clone weekly, the worst case is losing one week of work. That’s better than nothing but worse than Time Machine’s hourly backups.

Don’t replace Time Machine with a clone. Run both:

• Time Machine: hourly, versioned, automatic
• Clone: weekly, point-in-time, used for emergency restoration

Together they cover both “I deleted a file 30 minutes ago” (Time Machine) and “my Mac is dead and I need a working setup in 2 hours” (clone).

Storage requirements for clones

A clone destination needs to be at least as large as the used space on the source. Specifically:

• Boot drive used space: 400 GB → minimum 500 GB destination
• Boot drive used space: 800 GB → minimum 1 TB destination

You don’t need 2× like Time Machine — clones aren’t versioned (mostly), so you only need source size plus a small overhead.

For CCC’s SafetyNet to keep deleted files for 30 days, you do need extra space — typically 30-50% more than the source. If you have a 500 GB source, get a 1 TB destination if you want a meaningful retention window.

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Cloning a clean Mac is faster

Clones copy whatever’s on the source. A 600 GB Mac that’s actually 250 GB of useful work plus 350 GB of cache, leftover installers, and old simulator data takes 6× longer to clone than it needs to.

Before your first big clone, clean up the source. Sweep handles the categories that don’t belong in any backup:

• System and user caches that regenerate
• Old .dmg and .pkg installers
• App leftovers from drag-to-Trash uninstalls
• Localizations for languages you don’t use
• iOS device backups for old iPhones
• Local APFS snapshots past their useful window

A leaner source means a faster first clone, faster incremental clones, and a clone destination that fits more useful data. It’s the same logic as packing a moving truck — you wouldn’t fill it with broken furniture you’ve been meaning to throw out.

When you don’t need a clone at all

For most Mac users, Time Machine alone is enough. Cloning is overkill for someone who:

• Stores all important files in iCloud Drive or Dropbox
• Doesn’t have huge local files (Photos library, Final Cut projects, big Xcode codebases)
• Is fine waiting 2-4 hours for a fresh macOS install plus Migration Assistant if disaster strikes

If you do need a clone, you probably know who you are: video editors with terabytes of project files, developers with massive codebases, photographers with multi-hundred-GB Lightroom catalogs. The pattern is “lots of local data that can’t easily live in the cloud.”

For everyone else, run Time Machine and pay for cloud backup, and skip the clone overhead.

A working clone setup

Here’s what a real clone workflow looks like in practice:

1. Hardware: 2 TB Samsung T7 Shield SSD ($170), USB-C connection
2. Tool: Carbon Copy Cloner ($40 license)
3. Schedule: Weekly, every Sunday at 2am, to that drive
4. SafetyNet: enabled, retention 30 days
5. Verification: monthly, restore one random file to confirm the clone works

That setup gives you a known-good copy of everything every week, with the ability to recover deleted files for 30 days, on a drive that fits in your pocket. Total cost: $210 plus 5 minutes of setup. If your Mac dies tomorrow, you’re up and running on a replacement in under 2 hours.

The clone you don’t have when you need one is the most expensive piece of hardware you’ll ever fail to buy. The clone you do have, you’ll forget about — until the day it saves you.