Identifier et résoudre les problèmes liés au matériel

Product: 
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.

Je constate une différence entre l'espace utilisé sur le disque de sauvegarde et celui utilisé sur le disque source. Pourquoi ?

Product: 
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.

Certaines applications se comportent différemment ou demandent un numéro de série après la restauration à partir d'une sauvegarde. Pourquoi ?

Product: 
ccc6

Certaines applications refusent de fonctionner après un transfert sur un nouveau disque ou lorsqu'elles sont exécutées sur un autre Mac. Ceci n'a aucun rapport avec la sauvegarde de vos données par CCC et se résume à des contraintes de sérialisation imposées par l'éditeur du logiciel (autrement dit sa stratégie antipiratage).

System problems can lead to a failure to install CCC's helper tool

Product: 
ccc6

Configuration files for privileged helper tools are placed in the /Library/LaunchDaemons folder on your startup disk. CCC never touches this folder directly, rather it uses the macOS "Service Management" service to install and load its helper tool configuration. If the permissions or ownership of this folder are incorrect, however, the Service Management daemon (smd) will fail to install the helper tool configuration, and this service offers no recourse. Often the helper tool installation will fail with a nondescript error, e.g. "CFErrorDomainLaunchd error 2".

Why does CCC say that my Mac is booted from a backup volume?

Product: 
ccc6

If you boot your Mac from a backup volume, CCC will be started upon login to ask whether you'd like help restoring from that backup volume. Sometimes, though, this offer is made when you're booted from a production volume, not a backup. CCC makes this assessment based on your currently-defined backup tasks. If you used CCC to migrate from one drive to another, then the task that you used to perform that backup will still be present on your new startup disk.

Can I run my backups more frequently than Hourly?

Product: 
ccc6

CCC offers hourly, daily, weekly, and monthly scheduling options, which suits the needs of most users. Some usage scenarios, however, demand higher frequency backups. For example, photographers might prefer to have their SD cards offloaded to a tethered computer every 5-15 minutes during a photo shoot. When the shoot is complete, though, the backup task should not run at all. Special cases like these demand more flexible execution options, which can be achieved by leveraging CCC's built-in command-line utility.

Can I run backup tasks while my system is on battery power?

Product: 
ccc6

CCC can run backup tasks while the system is running on battery power, but will not (by default) start automated tasks when your laptop is running on battery power. Backup tasks generate a lot of disk read and write activity, and that can run your battery down. Additionally, macOS tends to aggressively put the system to sleep when it's on battery power, causing task completion to be deferred until the system is awoken.

When I boot from my backup, Little Snitch reports that its rules have been replaced by a different version. Why, and how can I avoid this?

Product: 
ccc6

According to ObDev developers, it is crucial for Little Snitch to avoid unnoticed ruleset changes. Little Snitch therefore has numerous mechanisms to detect whether it is using the exact same ruleset file, as in, on the same volume and at the same physical address on that disk. This sort of mechanism makes it impossible for Little Snitch to use the ruleset on the booted backup volume without physical intervention from a user at the system (thus the dialog asking if it's OK to use the current version of rules or to use a default ruleset).

Frequently asked questions about scheduled tasks

Can I use CCC to copy a Time Machine backup?

Product: 
ccc6

No. Copying a Time Machine backup volume with anything other than the Finder is not supported (by us, nor Apple); CCC specifically disallows copying anything to or from a Time Machine backup volume. Apple does not document a procedure for making copies of Time Machine volumes.