Support for backing up to/from network volumes
This version adds support for backing up to and from non-HFS+ volumes. Specifically, you can back up the contents of FAT32 and NTFS volumes, as well as the contents of a network-attached volume (e.g. AFP, SMB). CCC will preserve as much filesystem metadata as possible, and will warn when incompatibilities exist between the source and destination filesystems. Please note that clones of NTFS volumes will not be bootable.

Folder-to-folder backups
You can choose a specific folder as the source and destination; you're no longer limited to backing up to and from the root of a volume.

Restore directly to the startup disk
CCC now permits specifying the startup disk as a destination volume. Users are no longer required to boot from the backup volume to restore non-system files.

New "Disk Center" reports disk performance statistics
CCC now has a "Disk Center" window that offers information about how your volumes are partitioned and formatted, as well as performance statistics. If one of your hard drives encounters latency or media read/write issues, CCC will indicate these errors.

Support for Lion Full Disk Encryption
CCC's Disk Center offers access to Lion's new "Full Disk Encryption" feature. You can use CCC to enable and disable the encryption of your backup volume(s), and see the progress of any conversion processes.

Expert troubleshooting advice from the new "Cloning Coach"
The new "Cloning Coach" offers proactive insight on potential configuration problems as well as expert advice directly to the user about any errors that were encountered during the backup task. When CCC discovers filesystem corruption and media failures, the errors are now explained in layman's terms, with simple advice on how to resolve the errors. A convenient "Reveal in Finder" or "Launch Disk Utility" button gets you on your way to resolving complex problems.

Automount local, network, and encrypted volumes
CCC makes a diligent effort to mount the underlying volume(s) to the source and destination before a scheduled task executes. If your source and/or destination disk is unmounted, but attached to your Mac (and powered on, of course), CCC will attempt to mount those volumes.

Email and Growl notifications
CCC will send notifications to Growl when a backup task begins, ends successfully, and ends with errors. CCC can also send email notifications when a scheduled backup ends successfully or when it ends with errors.

Sleep/shutdown/restart at the end of a scheduled task
CCC now offers the ability to sleep, restart, and shutdown your Mac at the end of a scheduled task.

Automated archive pruning
CCC can now automatically prune the contents of your archived files prior to a backup task. Pruning can be specified to limit the size of the archived content, remove items older than a certain age, or to provide a certain amount of free space on the destination volume before proceeding. Pruning only affects the contents of the "_CCC Archives" folder at the root level of the destination.

CCC now leverages Keychain services to store passwords for encrypted disk images and network filesystems, allowing CCC to automatically mount an encrypted disk image or network volume during a scheduled task. Please note that the creation of encrypted disk images is limited to users running Leopard and higher.

Added support for saving a task configuration that only runs manually.

CCC now supports the creation of sparse bundle disk image files for users running Leopard and higher.

You can now specify AES-128 or AES-256 encryption for encrypted disk images.

During scheduled tasks, CCC offers the capability to unmount the destination volume or set it as the startup disk after the task completes.

CCC now allows you to manage the treatment of deleted and modified items on the destination volume separately. Items that have been deleted from the source since a previous backup task can now be archived, moved to the Trash, deleted immediately, or left alone. Items that have been modified since the last backup task can be archived, moved to the Trash, or overwritten.

CCC offers an option to not overwrite files on the destination if they are newer than the file on the source. Previously, files on the destination would be overwritten if the size or modification date differed, even if the file on the destination was newer. The previous behavior is still the default, as the primary scope of CCC is to make your destination volume look like the source volume (e.g. a backup).

CCC now offers a checksum-based comparison method for determining if a file should be updated on the destination. By default, CCC uses only file size and modification date to determine if a file should be updated on the destination. A periodic checksum analysis can find any previously-backed up files that have become corrupted on the backup volume (e.g. "bit rot").

CCC can now impose a bandwidth limit on data transfer to/from a remote Macintosh.

CCC offers an option to run the deletion pass prior to the file copying pass. In cases where space on the destination volume is tight, this will allow CCC to more consistently complete the backup task.

CCC is now a bit more permissive in allowing scheduled tasks that specify a disk image on the startup disk as the destination.

Fixed a problem introduced in 3.3.7 in which CCC would under-report the amount of data copied if the backup task included a file larger than 4GB.

Fixed a bug in which the scheduled task helper application would crash at the end of the backup task under a unique set of circumstances.

Improved error management related to block-level copies.

CCC will now reformat the destination volume after a failed or aborted block-level copy, rather than leaving the cleanup task to the user.

Resolved an issue in which file ownership might get mapped to different numerical IDs when backing up to a remote Macintosh that has similarly-named user accounts.

Fixed an issue in which CCC would report that it was unable to delete a non-empty folder.

CCC will now properly format a new disk image as Case Sensitive HFS+ if the source volume has that format.

CCC will now warn of potential conflicts if the destination volume is not formatted as Case Sensitive HFS+ and the source volume is.

Fixed a bug in which the clone status panel would not be removed from the screen if the application was hidden.

Significant improvements to backup performance to/from a remote Macintosh.

Fixed a performance issue in which CCC would hang upon launch if a damaged hard drive was attached.