L'espace utilisé sur la destination ne correspond pas à la source. Certains fichiers ont-ils échappé à CCC ?

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ccc6

L'utilisation du disque sur votre disque de démarrage ne reflète pas la quantité de données qui doit être sauvegardée ; l'utilisation du disque sur la destination devrait être inférieure à l'utilisation du disque sur la source après la réalisation d'une sauvegarde initiale de votre disque de démarrage. Les périphériques de système de fichiers spéciaux (p. ex. aperçus de système de fichiers) et certaines données de service macOS ne peuvent pas ou ne doivent pas être copiés sur un autre volume.

Identifier et résoudre les problèmes liés au matériel

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ccc6

Les composants matériels peuvent parfois mourir d'une mort lente et d'un illogisme exaspérant. À un certain moment, il semble possible de copier des données sur un disque et de l'utiliser normalement. À l'instant suivant vous devez faire face à des erreurs apparemment venues de nulle part, des blocages, des plantages, un volume de destination qui disparaît en pleine tâche de sauvegarde, un Finder qui ne répond plus et à un système qui semble partir en vrille.

macOS Big Sur Known Issues

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ccc6

Some Big Sur startup volumes don't appear in the Startup Disk Preference Pane

In the past, the Startup Disk Preference Pane would list all available startup volumes, including CCC backup volumes. When Apple's APFS replication utility is used to copy a Big Sur System volume (something that is now required on macOS Big Sur), however, the cloned volume will not appear in the Startup Disk Preference Pane, despite being perfectly bootable.

Coping with errors caused by APFS filesystem corruption

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ccc6

We regularly see cases of APFS filesystem corruption that lead to errors during a backup task. This corruption is typically presented in an error like one of these:

readlink_stat("/Photos/Foo/2020_Dumpster_fire.jpg") failed: Illegal byte sequence (92)
rename("/Photos/Foo/.2020_Dumpster_fire_out_of_control.jpg.asdfgh" -> "/Photos/Foo/2020_Dumpster_fire_out_of_control.jpg") failed: No such file or directory (2)

When CCC encounters these errors, the affected items are listed in CCC's Task History window, often with this advice:

Some third-party storage drivers may cause hardware misbehavior

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ccc6

We occasionally receive reports of strange behavior from USB devices, e.g. slow performance, disks dropping offline in the middle of the backup task. In some of those cases we've discovered that third-party storage drivers are causing the problem. In particular, the SAT-SMART drivers and some ancient BlackBerry USB drivers can lead to problems. If you're troubleshooting a USB device behavior or performance problem, we recommend that you consider uninstalling these drivers.

macOS Catalina Known Issues

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ccc6

Some SMB volumes can't support macOS sparse disk images

We have received several reports that macOS is unable to create disk images on SMB volumes hosted by various NAS devices. If you attempt to create the disk image in Disk Utility (for example), Disk Utility reports an "RPC Error". After months of investigation, we have concluded that macOS Catalina has more stringent requirements for sparse disk images than previous OSes.

Why does Finder prevent me from viewing the home folder on my backup when it's attached to another Mac?

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ccc6

Note: This problem only affects macOS Catalina

Why can't I eject the destination volume after the backup task has completed?

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ccc6

The disk Backup wasn't ejected because one or more programs may be using it.

Occasionally this annoying message comes up when you're trying to eject your destination volume. If CCC is currently using that volume as a source or destination to a running backup task, then CCC will effectively prevent the volume from being unmounted. If your backup task is not running, though, CCC isn't preventing the volume from being unmounted. But what application is?

Where can I find CCC's log file?

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ccc6

It is our aim to have the Task History window provide the user with enough information to find and troubleshoot any problems they're having with their backup tasks. For debugging and support purposes, however, CCC logs its activity in the following files:

Troubleshooting slow performance when copying files to or from a network volume

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ccc6

Network performance is usually the bottleneck of a backup task that copies files to or from a network volume, but there are several other factors that can affect performance as well. Here are some suggestions for improving the performance of your NAS-based backups.