If your backup volume is dedicated to your CCC backup task, then converting the destination to APFS is the right choice. The conversion is non-destructive, and it's required for making a backup of the system. Typically there is no reason to decline the conversion. If you're still having trouble correcting the partition scheme, you may find this video demonstration helpful. Set the Scheme to GUID Partition Map and the Format to APFS, then click the Erase button.Don't click on the Partition button! That would seem like the obvious choice, but you cannot actually change the partitioning scheme in the Partition interface. Click on the Erase button in the toolbar.If you don't click on the parent device, you won't be able to change the partition scheme. Choose the parent device of your destination volume in the sidebar – don't click on the backup volume itself, click on its parent device.Choose Show all devices from Disk Utility's View menu.Preparing a hard drive for use with Carbon Copy Clonerĭisk Utility's interface for performing this simple task is surprisingly unintuitive, so here is a summary of the process with some emphasis on the steps where people often go awry: This section of CCC's documentation walks you through the steps for configuring your backup disk: That partitioning scheme can't accommodate Apple's APFS filesystem, so before you can use your backup disk for making a bootable backup of your startup disk, you must make sure that it is partitioned with the correct partitioning scheme. Many external hard drives are shipped with a Windows-centric format and partitioning scheme. Video: Preparing your destination for a CCC task I want to back up multiple Macs or source volumes to the same hard drive
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See this section of CCC's documentation for guidance on how to configure your destination device to accommodate backups of multiple source volumes: This is particularly important when one of the sources is a Catalina or Big Sur startup disk.
Ideally, each source that you back up will have a dedicated volume on the destination. If you have multiple tasks that back up to the same destination, however, then now is a good time to revisit your backup "hygiene".
If your destination volume is encrypted, however, see the question later in this document for information specific to encrypted destinations. CCC will automatically make the changes required for your destination to be a bootable backup of your startup disk. If you are making a simple backup of your startup disk to a dedicated backup disk, then no, you do not have to make any changes to the destination unless CCC specifically recommends it.
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