Making matters worse, Finder does not accurately represent the true disk usage of your files. While APFS file cloning saves space on your source volume, those space savings can't be consistently applied when copying your files to another volume. The aforementioned APFS file cloning feature, however, adds a new dimension to this concern. Why doesn't the disk usage on my backup disk match the disk usage on the source disk?ĬCC's global exclusions as well as the SafetyNet feature have traditionally led to legitimate differences in disk usage in the past. They serve completely different purposes APFS file cloning is not at all related to making backups. The important take-away is that APFS file cloning can save you space on your startup disk, but CCC backups can save your data if your source disk fails. In some cases CCC may clone a file on the destination prior to updating its contents. CCC is typically copying files between volumes, so APFS cloning isn't applicable for that kind of task. duplicate a file or folder in the Finder). APFS file cloning only works when you make copies of a file on the same volume (e.g. The two files will share storage on the disk for portions of the files that remain identical, but changes to either file will be written to different parts of the disk. When cloning a file, the file system doesn’t create copies of the data, rather it creates a second reference to the file that can be modified independently of the first file. No, the cloning functionality within APFS is completely unrelated to the copying that CCC performs, although in some cases CCC does leverage the APFS file cloning functionality.ĪPFS cloning allows the user to instantly create copies of files on the same volume without consuming extra storage space. I heard that APFS has a "cloning" feature. CCC doesn't have to encrypt those files, they're encrypted on-the-fly by the filesystem as the bits are written to disk. via the Security Preference Pane while booted from the backup), then the files on the destination will be encrypted. Likewise, if you enable FileVault on the destination volume (e.g. Those files are decrypted on-the-fly by the filesystem when they're opened by an application. If you enable FileVault on your startup disk, then the files on your startup disk will be encrypted. ![]() Note that CCC doesn't play any role in the encryption process – encryption is a function of the volume, not of the tool that's writing a file. Yes, CCC can backup to and from encrypted APFS volumes (aka FileVault encryption). ![]() Every time you look for a file, open a file, move a file, save a file or delete a file, it's the filesystem that is fulfilling that action. The file system also keeps track of how many files you have and how much space they consume. The file system keeps track of and organizes all of the files on the hard drive, and also determines which users and applications have access to those files. Every user and every application uses the file system. It’s also one of the most transparent, at least when it’s working correctly. The file system is perhaps the most important piece of software on your Mac. ![]()
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