- OS X 10.10 Yosemite
- OS X 10.11 El Capitan
- macOS 10.12 Sierra
- macOS 10.13 High Sierra
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 partition or hard drive is required for a bootable backup of macOS 10.10 through 10.12.
- APFS or HFS+ formatted partition or hard drive is required for a bootable backup of macOS 10.13 High Sierra
- APFS source and destination volumes are only supported on macOS 10.13 High Sierra
- SMB network file systems (AFP is permitted, but is deprecated by Apple)
- Backup of user data is supported on some non-Apple-formatted (HFS+ and APFS) filesystems
- Hard drives in Firewire, eSATA, Thunderbolt and USB enclosures *
- CCC is supported only on machines that officially support OS X 10.10 Yosemite (or higher)
- A minimum screen resolution of 1024x768 is required
* Not all hard drive enclosures are capable of booting macOS. Check with the manufacturer of your hard drive enclosure to verify that booting from the enclosure is explicitly supported. 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 and FTP protocols are not supported