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Because they are volume-specific preferences, the exclusion of these items from a day-to-day backup seems most appropriate. Apple-proprietary data stores. Attempting to copy these data stores without unmounting the source and destination is not only futile, it will likely corrupt them and their respective apps will reject them and recreate them. The Versions database stored in this folder contains references to the inode of each file that is under version control. File inodes are volume-specific, so this dataset will have no relevance on a cloned volume. The caches must be regenerated on the new volume as the on-disk location of system files and applications will have changed.

OS X automatically regenerates the contents of these folders when CCC is finished updating the backup volume. NetBootX In the unlikely event that your Macintosh is booted from a Network device, OS X will store local modifications to the filesystem in this folder. These local modifications are not stored in a restorable format, therefore should not be backed up. In general, you should not attempt to back up a NetBooted Mac. These should not be backed up, they are dynamically created every time you start the machine. The contents of these files is never accurate for the destination volume, so given the kernel's unruly behavior with copies of these files, CCC excludes them.

According to the quotacheck man page, these files should be regenerated every time a quota-enabled volume is mounted e. Depending on how you use OS X and your hardware configuration, this could be more than 50GB of data, and all of it changes from one hour to the next. Having this data for a full-disk restore does you absolutely no good — it makes the backup and restore processes take longer and the files get deleted the next time you boot OS X.

Trashes Moving an item to the trash is typically considered to be an indication that you are no longer interested in retaining that item.

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If you feel strongly that CCC should not exclude the contents of the Trash by default, your feedback is welcome. Time Machine uses proprietary filesystem devices that Apple explicitly discourages third-party developers from using. Additionally, Apple does not support using a cloned Time Machine volume and recommends instead that you start a new Time Machine backup on the new disk. When corruption occurs within these local data stores, OS X moves the corrupted items into the folders indicated above. OS X doesn't report these corrupted items to you, nor does it attempt to remove them.

CCC can't copy the corrupted items, because they're corrupted. The kacta and kactd files, for example, are created by antivirus software and placed into a special type of sandbox that makes them unreadable by any application other than the antivirus software. The last two items can be found in each user home folder. Excluding these items prevents the applications that were open during the backup task from opening when you boot from the backup volume. This seems appropriate considering that Apple intends the feature to be used to open the applications that were in use when you log out, restart or shutdown, not at an arbitrary point during the backup task.

CCC offers the option to run shell scripts before and after a backup task, unmount or set the destination as the startup disk, run another CCC backup task, and power management options such as restart and shutdown. If you would like to perform any of these pre or post clone tasks, click on the "Use Advanced Settings" button at the bottom of of CCC's window. Mounting the source or destination volume before a backup task begins Without any additional configuration, CCC will attempt to mount your source and destination volumes before a backup task begins.

This applies to many different volume types — ordinary volumes on locally-attached hard drives, disk images, network volumes, and encrypted volumes. If your source or destination volume is on a disk that is physically attached to your Mac e. If your source or destination is a network volume, CCC will obtain the credentials that you use to mount that device when you create the backup task, and will use those credentials to mount the volume before the task begins.

This also applies for nested volumes.

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For example, suppose you are backing up to a disk image on a network volume. Likewise, suppose you have a task configured to back up the contents of a folder on an encrypted volume. If you have saved the encrypted volume's passphrase in CCC's keychain, CCC will unlock and mount the encrypted volume before the backup task begins. CCC's attempts to mount the source and destination volumes occur automatically before any other tasks, including pre clone shell scripts described below , therefore it is not necessary to implement a shell script to pre-mount the source or destination.

Performing automated tasks before and after copying files Destination volume options If you would like CCC to unmount your destination volume at the end of the backup task, choose "Unmount the destination volume" from the Destination volume management menu. If your destination is a folder, the text will be "Unmount the underlying volume". If the destination is a disk image, CCC always unmounts the disk image volume, so this setting refers to the underlying physical volume upon which the disk image resides.

CCC will not forcefully unmount the destination volume. If an application has open files on the destination volume, CCC's attempt to unmount the volume will fail. CCC does not report this as an error, though it will make a note of it in the task's history. If you would like to set the destination volume as the startup disk, for example to automate the regular testing of your backup volume, choose "Set as the startup disk" from the Destination volume management menu.

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We do not recommend disabling System Integrity Protection to make this feature work, rather we recommend that you use the Startup Disk Preference Pane to change the startup disk selection. Instead, the system will perform as defined by the settings in the Energy Saver preference pane.

For example, if you have the system configured to idle sleep after 20 minutes, the system will go to sleep if there hasn't been any user activity in the last 20 minutes. CCC activity is not considered user activity, so often the system will go to sleep immediately after CCC finishes a backup task. If you choose one of the options from the Power management menu, CCC will reboot or shut down your Mac when the backup task finishes.


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The reboot and shutdown options are not forceful. If you have a document open with unsaved modifications, for example, the application would prompt you to save the document. If a save dialog is not attended to, the shutdown or reboot request will time out. Turn off the computer if it was previously off If your backup task is scheduled to run on a regular basis, this option will be enabled in the Power Management popup menu.

This option is applicable if you would like to have CCC shut down your Mac at the end of the task, but only in cases where the Mac was booted at the task's scheduled run time. If your backup task runs when the system has been on for a while or has been sleeping, CCC will not shut down the Mac when using this option. Power Management options are ignored in some cases Power management options will not be applied to backup tasks that are cancelled e. Additionally, power management tasks will not be applied if other CCC backup tasks are running or queued to run immediately after the current task finishes running.

Power Management options are applied regardless of task success Power management options will be applied whether the backup task completes successfully or not.

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Run another backup task task chaining If you have more than one CCC backup task configured, the other tasks will be listed in this popup menu. To create a task chain, simply choose one of these tasks to have that task run automatically after the current task finishes.


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Tasks run in this manner will start after the current task has finished completely. Chained tasks will run regardless of the exit status of a preceding task in the chain, e. Running shell scripts before and after the backup task If there is functionality that you need that does not exist within CCC, pre and post clone shell scripts may be the solution for you.

Pre clone shell scripts run after CCC has performed "sanity" checks e. Post-clone shell scripts run after CCC has finished copying files and performing its own internal cleanup, but before unmounting any volumes. CCC passes several parameters to pre and post clone shell scripts. Second parameter The path to the destination volume or folder.

If the destination is a disk image, this is the path to the mounted disk image. Third parameter The contents of this parameter has changed since CCC 3, so take care to update the logic in any shell scripts that you used with earlier versions of CCC. Pre clone script: The underlying mountpoint for the volume that holds the destination disk image, if applicable.

Post clone script: The exit status of the file copying phase of the backup task. Fourth parameter The path to the destination disk image, if applicable. The contents of this parameter has changed since CCC 3, so take care to update the logic in any shell scripts that you used with earlier versions of CCC. If your pre clone script exits with a non-zero exit status, it will cause CCC to abort the backup task.

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This can be used to your advantage if you want to apply preconditions to your backup operation. If you want to be certain that errors in your pre clone shell script never cause the backup task to be aborted, add "exit 0" to the end of your script. If your script should behave differently depending on the result of the task, you can test whether the third parameter is zero an exit status of "0" means the task ended successfully.