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What happens to data already on the target drive? |
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If you already have data on your target drive, the "Incremental backup of selected items" method will only delete those items if:
1. You have selected the "Delete files that don't exist on the source" option
AND
2. The file does not exist on the source
If a file exists on the source and target at the same path (e.g. /Users/bob/Desktop/file.txt and /Volumes/Backup/Users/bob/Desktop/file.txt), then the file on the target volume will be overwritten if it has a different modification date (newer or older) than the file on the source, or if the file size is different. Otherwise it will be left untouched.
Additionally, directories whose names begin with _CCC on the target will never be deleted while using the "Incremental backup of selected items" cloning method. These items may be deleted if you have selected the "Delete files that don't exist on the source" option, you're using the "Backup everything" cloning method, and CCC can proceed with a block-level clone. Special handling of items at the root level of the target volume are described in the "Protect root-level target items" section of the documentation.
PLEASE NOTE: We strongly recommend that you find the means to dedicate a volume to the task of backing up your irreplaceable data. If you have data on your backup volume that exists nowhere else, it is not backed up! Whenever you target a volume for use with Carbon Copy Cloner, there is a risk that some files will be removed for one legitimate reason or another. CCC offers options and warnings to protect your data from loss, but nothing can protect your data from a misuse of CCC or a misunderstanding of the functionality that it provides.