We recommend limiting the use of this option to weekly or monthly, and scheduling such tasks to run when you are not typically using your Mac. While this is an excellent method for finding unreadable files on the source or destination, it will dramatically increase the amount of time that your backup task takes, and it will also increase CPU and hard drive bandwidth consumption on your Mac. CCC then compares these checksums to see if a file should be recopied. When using this option, CCC will re-read every file on the source and every file on the destination, calculating a checksum of each file. Find and replace corrupted filesĬCC offers an advanced option to "Find and replace corrupted files". If you do want the backup volume indexed, drag its icon out of the "Privacy" tab after the cloning and indexing will start immediately. To disable Spotlight indexing on a volume that is dedicated to backup, drag the icon of the destination volume into the "Privacy" tab of Spotlight Preference Pane in the System Preferences application. Having a Spotlight index of your backup volume may be unnecessary as you probably want to search for files only on your source volume. As you copy new data to your destination volume, for example, Spotlight wants to read those "new" files so it can index their contents. Spotlight indexing is one such process that CCC typically must compete with for disk bandwidth. Spotlight IndexingĪnything that causes CCC to compete for bandwidth to your source or destination volume will increase the amount of time that it takes to back up your data. If you find the performance of your backups to be too slow, we recommend using an SSD for your backups. If you're making a backup of macOS Catalina, APFS is required. APFS is the new, modern standard, but its performance on rotational devices is inferior to HFS+. If you have an older, rotational HDD, it's generally better to format that device using the "Mac OS Extended, Journaled" (HFS+) format if you're backing up macOS High Sierra (or older), or if you're making a data-only backup. It's important to choose the right filesystem for the hardware that you have and the data that you're backing up. Finally, you will see better performance with faster/more efficient interfaces - USB 3.1 is faster than USB 3.0, USB 3.0 is faster than USB 2.0, etc.Īdditionally, if your source volume is nearly full and is a rotational disk, we recommend that you replace it with a larger hard drive to avoid the performance implications of filesystem fragmentation. a volume filled with just a few very large files. You will also get longer copy times when you have lots of small files vs. ![]() Especially as Apple's new APFS filesystem becomes harder to avoid, we recommend using SSDs for any volume that has an installation of macOS, including your backups. physically smaller, like those in 2.5" hard drive enclosures), for older hard drives, and for hard drives that are nearly full and thus more likely to be fragmented. Performance will be worse for smaller rotational hard drives (e.g. Your backups will be no faster than your slowest disk. Hard drive performance and interface bandwidth ![]()
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