- OS X 10.10 Yosemite
- OS X 10.11 El Capitan
- macOS 10.12 Sierra
- macOS 10.13 High Sierra
- macOS 10.14 Mojave
- macOS 10.15 Catalina
Older versions of CCC are still available for users running older OSes. Note that these older versions are not actively being developed and support is provided on a case-by-case basis.
- HFS+ formatted volume is required for a bootable backup of macOS 10.10 through 10.12.
- APFS or HFS+ formatted volume is required for a bootable backup of macOS 10.13 High Sierra and Mojave
- APFS formatted volume is required for a bootable backup of macOS 10.15 Catalina and later
- APFS source and destination volumes are only supported on macOS 10.13 High Sierra and later
- Backup of user data is supported on some non-Apple-formatted (i.e. not HFS+ or APFS) filesystems
- SSDs and hard disk drives1 in Firewire2, Thunderbolt and USB enclosures3
- CCC is supported only on Apple Macintoshes that officially support OS X 10.10 Yosemite (or higher)
- A minimum screen resolution of 1024x768 is required
1: APFS is not suitable for use on HDDs with a rotational speed of less than 7200RPM
2: macOS Catalina+ does not support booting a Mac via a FireWire-attached device
3: Not all hard drive enclosures are capable of booting macOS. See the Preparing a hard drive for use with Carbon Copy Cloner and Help! My clone won't boot sections of the CCC documentation for more information on disk formatting, partitioning, and general bootability concerns. These restrictions apply to the ability of the device to boot a Mac, any of these devices are suitable for general backup.
- CCC will not clone to or from an unformatted or unmounted device — the source and destination must have a filesystem recognized by macOS and visible in the Finder
- Cloning Windows system files is not a supported configuration
- CCC will not backup directly to optical media (e.g. CD-ROM or DVD-ROM)
- WebDAV, FTP and NFS protocols are not supported
- macOS Mojave and later cannot boot from a RAID device
- CCC is not a two-way synchronization solution designed to keep two Macs in sync with each other — this is not a supported configuration.
- Performing mass deployments with CCC is not supported. Apple discourages this sort of deployment and offers additional resources here, and there are alternative solutions to consider.