![]() 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 Excluding files and folders from a backup task.Because these items are excluded from your daily backups, CCC will not spend time or RAM enumerating through those files for changes. ![]() CCC will not delete excluded items from your destination (unless you ask it to using Advanced Settings), so as long as you keep the original on your source volume, you will always have two copies of your archived content. For example, if you have a large number of files that never change (perhaps some old, completed projects), you can collect these into a folder named "Archives", back it up once, then exclude it from future backups. If you have a particularly high number of files on your source volume, you may want to put some thought into how your files are organized. Reduce the number of files considered for backupĬCC analyzes all of the files that are included in your backup set for consideration to be copied. Here we describe the most common conditions that affect backup performance, and offer some suggestions for mitigating the effects of those conditions. There are several factors that affect the performance of your backup tasks. ![]()
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