• 10.15.4 introduced a small timing issue that can occur when CCC attempts to delete the transient source snapshot at the end of the backup. This error is harmless, and the snapshot is removed automatically later, but this update adds a more aggressive method of removing the snapshot.
  
  
• 10.15.4 also introduced a change that can cause trouble for setting up a remote Macintosh source or destination. This update resolves an error indicating that the remote Macintosh could not be reached during the initial setup.
  
  
• Fixed a dead end that can occur when a backup task encounters an error thats calls for aborting the backup task (e.g. due to a stall, or when the destination volume pops offline in the middle of the task).
  
  
• Improved the reliability of the option to reveal an APFS Data volume in the Finder (via the volumes table contextual menu or via the Source/Destination selectors).
  
  
• Minor improvement to the handling of sparse files on APFS volumes. Also improved progress indication while copying particularly large sparse files.
  
  
• Made a small adjustment to the handling of BoxCryptor volumes.
  
  
• The "Defer if another task is writing to the same destination" setting now considers other volumes in the same APFS volume group to be the same destination. This addresses cases where one task is configured with the System volume as the destination (a standard configuration for a bootable backup) and another task is configured to back up to a folder on the Data sibling of the same volume (also a standard configuration for a folder-to-folder backup).
  
  
• Improved case conflict detection in cases where the source or destination is a member of an APFS volume group.
  
  
• In cases where a task is configured to back up to a disk image on a NAS volume, and the diskimages-helper service dissents the unmount request for the underlying NAS volume at the end of the task, CCC now terminates the offending process to make a followup unmount request more effective.
  
  
• The option to suppress the destructive task warning is now reset when resetting a task to default settings.
  
  
• Addressed some minor errors related to archiving the source APFS helper partitions that can occur if the source is a read-only device (e.g. a read-only disk image).
  
  
• Addressed an issue in which the startup disk setting would be set to the current startup disk when running a backup task (e.g. in cases where the current startup disk is not actually set as the startup disk selection in the Startup Disk Preference Pane).
  
  
• Remote Mac: If CCC's RSA key pair should become corrupted, CCC will now deal with the authentication failures more gracefully.
  
  
• Addressed a logic error that can lead CCC to restore items to the root of the selected destination volume rather than to a designated folder on that volume when restoring from a Data volume snapshot.
  
  
• Fixed an issue in which tasks that were flagged for review because the HFS+ destination will be converted to APFS were not presenting an APFS conversion dialog if the destination device was not attached.

CCC has many useful features, including Bootable Backups and Clone Recovery HD.

"The macOS Installer creates a proprietary recovery volume on your startup disk that can be used to reinstall macOS. CCC is the only backup software that archives and clones this recovery volume. We simplify this complex procedure into a single click!"