Frequently Asked Questions (FAQ)

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

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 clone will still be present on your new startup disk.

The legacy SafetyNet folder is not used when snapshots are enabled on the destination

SafetyNet is a feature unique to CCC that aims to protect data on your destination volumes. The most common scenario for which this feature was designed was to protect the contents of a volume that was errantly selected as a destination volume. Rather than immediately deleting the contents of that volume, CCC would place that content into a folder named "_CCC SafetyNet". When you realize the configuration mistake, you simply recover the files from the SafetyNet folder and then correct your backup task configuration.

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

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, nor even a notification that something is wrong that should be corrected.

Can I run my backups more frequently than Hourly?

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?

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.

Frequently Asked Questions about encrypting the backup volume

Glossary of Terms

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Frequently asked questions about scheduled tasks

Can I back up one computer and use the clone to restore another computer?

Often, the answer is probably yes. However, there are some caveats.

Frequently asked questions about the Carbon Copy Cloner SafetyNet folder

Note: The topics in this article are not relevant to APFS-formatted destination volumes that have CCC snapshot support enabled. For those volumes, CCC leverages snapshots to implement the SafetyNet functionality, and the snapshots aren't affected by any of the shortcomings described here.