Carbon Copy Cloner 5.1.17 Update Release notes (Catalina Compatible).
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Carbon Copy Cloner version 5.1.17 Update (release notes)
Available via in-app update for CCC 5.x users or full download at
Info from the May 12, 2020 Carbon Copy Cloner v5.1.17 release notes:
  • Creating a new task via the CCC menubar application now works more consistently.

  • Addressed a small logistical change introduced in macOS 10.15.4 that could lead to (harmless, but annoying nonetheless) errors while archiving the Preboot helper volume in a macOS Catalina volume group.

  • Addressed a small UI error that occurred when strict volume identification is disabled for a task and a matching volume is present. The issue was specific to APFS volume groups.

  • If a scheduled task was missed due to an encrypted volume being physically absent, CCC will now run that task and unlock the applicable volume when the device reappears. Previously the task would only run when the volume was unlocked by the user (and thus mounted), but now CCC will unlock the volume if a scheduled task was missed, or if the task is configured to run when the source or destination reappears.

  • Resolved an issue in which CCC would report that it was unable to delete a snapshot on a rotational startup disk while the system was busy defragmenting boot files (another treat bestowed upon us by Apple's 10.15.4 update!).

  • Resolved an issue introduced in CCC 5.1.16 that would cause CCC to fail to perform a task whose destination is a disk image on the startup disk.

  • Unmounted disk images that some application left attached (VirusBarrier, I'm looking at you) are no longer listed in CCC's sidebar.

  • When enabling the "Find and replace corrupted files" setting for a task that specifies an encrypted APFS volume group as the destination, CCC now presents a dialog requesting the password to that volume (if CCC doesn't already have it). This resolves a situation where the task would fail if CCC is unable to unlock and mount the destination Data volume.

  • If CCC establishes a connection to an SMTP server, but the server never responds to CCC's "EHLO" reply, CCC will retry the connection.

  • Fixed a crash that can occur in CCC's file copier while looking for case conflicts (only applicable if the source is case-sensitive and the destination is not).

  • Support for extended attributes is now disabled by default when the user selects a network volume (or a folder on a NAS volume) as the source or destination to the task. You're welcome to re-enable extended attribute support, but we have found that most NAS devices offer exceptionally poor support for extended attributes, and that disabling them is the best default configuration.

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!"
More info on Carbon Copy Cloner 5 (including 30 day trial) at

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