Backing up to a disk image

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ccc6

A disk image is a single file that contains the entire contents of another hard drive (except for the free space). When you want to access the contents of that filesystem, you double-click on the disk image to mount the disk image as if it were an external drive attached to the machine. We recommend using disk images sparingly. If you're backing up to a network volume and your Mac and the NAS device are connected to the network via ethernet, then a disk image may be a good fit. In most cases, however, disk images are not a great choice for your backup strategy.

Backing up large files, mounted disk images, and Virtual Machine containers

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Note: When backing up an APFS-formatted volume, CCC will copy files from a read-only snapshot of the source volume. The subject of this article is not applicable in those cases.

A caveat for backing up to a remote Macintosh that has no user logged in

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ccc6

For improved detachability, macOS will unmount any non-internal volumes that are attached to the system when you log out. So, for example, if you log out of your computer while a USB or Thunderbolt hard drive enclosure is attached, you can detach those hard drive enclosures from the system without having to manually unmount them first. This is a good thing — it would be annoying if you had to log back in to your system just to eject a drive. The downside of this, though, is that if you have a CCC backup task that runs when no user is logged in, the destination volume may be unavailable.

Downgrading an APFS-formatted Fusion volume from Mojave

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ccc5

If you upgraded your Mac to macOS Mojave and have decided to downgrade for one reason or another, the procedure is usually pretty straightforward. Fusion volumes, however, introduce a complication. Upon upgrading to Mojave, a Fusion volume will be converted from HFS+ to APFS. If you want to downgrade to High Sierra (or any earlier OS), you must reformat that Fusion volume as HFS+. Because APFS Fusion volumes are not handled gracefully by High Sierra, however, the procedure is a bit tedious.

What is CCC's Privileged Helper Tool?

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ccc5

At its core, Carbon Copy Cloner is a product that is designed to make bootable backups of your Mac's operating system. In order for CCC to be able to make copies of system files, CCC needs to have the privilege of copying files that can't be read nor written by just any user – CCC requires elevated privileges to copy macOS system files. Likewise, CCC is often tasked with copying the data associated with multiple users. macOS prevents you from accessing files that belong to other users.

Trabajar con encriptación FileVault

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ccc5

CCC es totalmente válido para utilizarse con volúmenes protegidos mediante FileVault (HFS+ y APFS). CCC ofrece varios consejos respecto a la activación de la encriptación en el Centro de discos.

Activar la encriptación en un volumen que contiene (o va a contener) una instalación de macOS

Si su objetivo es crear una copia de seguridad encriptada con función de arranque, use el siguiente procedimiento:

Organización de tareas

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ccc5

Añadir una tarea

Las tareas se pueden añadir de varias maneras diferentes. Si quiere crear una nueva tarea con ajustes por omisión, pulse el icono + en la cabecera de la tabla de tareas, seleccione Nueva tarea en el menú Archivo de CCC o pulse el botón Nueva tarea en la barra de herramientas de CCC. También puede duplicar una tarea existente: seleccione la tarea en la lista y seleccione Duplicar en el menú Archivo de CCC o haga clic con el botón derecho en la tarea y seleccione la opción para duplicarla.

Mantenimiento automático del SafetyNet de CCC

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ccc5

El contenido de este artículo no es aplicable en el caso de un volumen de destino con formato APFS con la opción de instantáneas activada. Consulte Activar/desactivar la función de instantáneas y definir una política de conservación de instantáneas para obtener más información sobre la política de conservación de instantáneas de SafetyNet.

Cloning Coach Configuration Concerns

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ccc5

CCC determines whether your destination volume will be bootable and indicates any configuration concerns in the "Cloning Coach" window. If you see a yellow warning icon in the Task Plan header, you can click on that icon to see these concerns. CCC will also present these concerns to you the first time that you configure a backup task to any particular destination volume.

Outgoing network connections made by CCC

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ccc5

If you're using an application firewall such as Little Snitch, you will see several outgoing network connections coming from CCC. We explain below what connections you should expect to see, and also explain why some connections that look unexpected are simply misreported by Little Snitch.

Ordinary activity

CCC will make external network connections for the following activity: