Apple introduced a bug in 10.15.5 that prevents the creation of firmlinks

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The chflags system call no longer works correctly on 10.15.5 with regard to setting the special 'firmlink' flag that establishes links between the System and Data volume group members. If you're establishing a new backup of macOS 10.15.5 or later, CCC 5.1.17 (and earlier) will be unable to create a correctly-functioning APFS volume group. Many folders on the destination volume will appear empty, and the volume will not be bootable.

Solution: Update to macOS 10.15.6 and CCC 5.1.20. See this blog post for more details.

We have reported this issue to Apple (FB7706647) and we are currently awaiting a response. Update: Apple resolved this issue in macOS 10.15.6. Apple made this 'bug' a permanent change, however, in macOS Big Sur.

Some SMB volumes can't support macOS sparse disk images

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We have received several reports that macOS is unable to create disk images on SMB volumes hosted by various NAS devices. If you attempt to create the disk image in Disk Utility (for example), Disk Utility reports an 'RPC Error'. After months of investigation, we have concluded that macOS Catalina has more stringent requirements for sparse disk images than previous OSes.

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Solution: Several users have reported that adjusting the SMB configuration on the NAS to support Time Machine can resolve the problem. Time Machine also uses sparse disk images on NAS volumes, so its requirements for the NAS file sharing service would be the same as those required for generic sparse disk image support.

Workaround A: Several users are reporting that connecting to the network volume via AFP rather than SMB resolved the problem:

Eject the NAS volume if it's currently mounted
Choose 'Connect to Server' from the Finder's Go menu
Type in 'afp://{server address}' to connect to the NAS volume via AFP
Choose 'New disk image..' from CCC's Destination selector and specify a new disk image on the AFP-mounted NAS volume

Workaround B: If connecting to your NAS volume via AFP is not an option, then you can back up user data (e.g. your home folder) directly to the NAS volume (i.e. don't use a disk image). We also recommend disabling support for extended attributes (via the Advanced Settings).

We recommend using NAS devices for secondary backups. For primary backups, we recommend that you procure a USB or Thunderbolt hard drive and create a bootable backup on that locally-attached disk. Local, bootable backups are much simpler and more reliable, and a lot easier to restore from should your Mac's startup disk fail. The logistics of restoring the operating system from a disk image on a network volume are pretty complicated if you don't have a functional startup disk. Providing that functional startup disk is the primary appeal of the CCC backup solution.

2012-vintage Macs can't boot macOS Catalina from an encrypted USB device

We have received several reports that the 2012 Mac mini and the 2012 MacBook Pro can initially boot from a non-encrypted external USB device, but then will fail to boot from that device when FileVault is enabled on the external device. This issue is not specific to CCC, we have confirmation that this occurs when installing Catalina directly onto an external device as well. This problem does not appear to be specific to any particular enclosure, rather it appears to be specific to the 2012 models of Mac mini and MacBook Pro.

We have reported this issue to Apple (FB7433465) and we are currently awaiting a response.

macOS Catalina will not boot from a FireWire device

Apple has dropped support for booting from FireWire devices. The macOS Catalina Installer will explicitly disallow installation onto a FireWire-attached device, and if you attempt to boot macOS Catalina from a FireWire-attached device, the startup process will fail with the universal 'no entry' symbol.

Solution: If your external device also has a USB interface, attach the device to your Mac using a USB cable instead.

Workaround: If your external device does not have a USB interface, you can continue to make backups to that device, but they will not be bootable while that device is attached via Firewire. If you need to restore data from this backup, you can either place the external hard drive into a different hard drive enclosure, or you can migrate the data to a fresh installation of macOS Catalina via the Migration Assistant application. If you prefer to maintain bootable backups, you should purchase an enclosure that will be bootable with macOS Catalina. We offer specific hard drive recommendations here.

Emerging issue: Higher incident rate of macOS Catalina failure to boot from Western Digital My Passport enclosures

We have received several reports now of Western Digital My Passport hard drive enclosures failing to function as a startup disk with macOS Catalina. In all cases the end user was able to confirm that the macOS Installer was also unable to make the device bootable. The results are inconsistent — in some cases the system proceeds approximately 75% into the startup process, then shuts down. In other cases the system transparently boots to the internal disk, and in other cases (probably most) the enclosure boots fine. Due to the number of cases of confirmed failed bootability, however, we discourage users from purchasing new WD My Passport HDD enclosures if your intent is to create a bootable macOS Catalina backup. Please note that the WD My Passport SSD is NOT included among these reports. WD My Passport enclosures with a rotational HDD should be avoided.

Mount issues render USB thumb drives unsuitable for bootable backups

We have discouraged the use of thumb drives in the past due to performance and reliability issues related to making these devices bootable. In the past the macOS loginwindow service has prevented CCC from mounting the APFS helper partitions on these devices. Now that the Catalina System and Data volumes are also special APFS volumes, we're seeing the same sort of interference from the loginwindow service, although now it leads to failures in backing up the Data volume. We are no longer offering support for these devices as bootable backups. You're welcome to create a non-bootable backup of your Catalina Data volume instead:

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Open CCC and click the Show Sidebar button in CCC's toolbar if it is not already visible
Select your backup task in the sidebar
Drag the Macintosh HD - Data volume from CCC's sidebar into the Source selector
Save the task

Startup Disk Preference Pane doesn't show OS versions for external volumes

The System Preferences application lacks full disk ac

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