If you see something in the audit that you don't feel needs to be backed up, especially cache folders with a particularly high file count or a large amount of data, right-click on the item and choose the option to exclude it from the backup task.Sort the list by Size, then browse through the changes.Click on the Audit tab in the center of the window.Select one of your regularly-recurring task events.Click Task History in the toolbar to open CCC's Task History window.A few minutes reviewing the audit can add up to lots of time shaved off your regular backups. Take a moment to review your task audits to see if there is content that doesn't have to be backed up. MacOS is constantly touching log and cache files, and those files can add up to a lot of changes for every backup task. Trim unnecessary content from the backup task Excluding files and folders from a backup task.Because these items are excluded from your daily backups, CCC will not spend time enumerating through those files for changes. CCC will not delete excluded items from your destination (unless you configure the Task Filter to do so), 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. because the source volume doesn't support it), and if you have a particularly high number of files on your source volume, you may be able to reorganize your data set and apply some exclusions to improve task performance. If the aforementioned Quick Update feature is not applicable (e.g. Reduce the number of files considered for backup Click the Advanced Settings button at the bottom of the CCC window, then you'll find the Quick Update option in the Performance & Analysis tab. Especially for data sets with a lot of small files in folders that are infrequently modified, this feature can improve performance by many orders of magnitude. Rather than evaluating all files and folders in the source data set, CCC will collect a list of folders that have been modified since the last backup task from the macOS FSEvents service. The Quick Update feature can greatly reduce the amount of time it takes to compare items on the source and destination. 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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