• Fixed an issue in which folders in the Task Filter window were missing a disclosure triangle, making it difficult to exclude subfolders.
  
  
• Improved OneDrive and Dropbox placeholder file detection.
  
  
• If you've deleted a Catalina System volume from a destination volume group, CCC now allows the selection of the orphaned Data volume as a destination, and will recreate the volume group as necessary.
  
  
• Made a couple small adjustments that should make HFS+-to-APFS conversions more reliable, particularly for slower destination devices.
  
  
• CCC 5.1.10 addressed an issue in which a remote Mac could go to sleep between CCC's archive management and file copying requests, but we found that change to be inadequate. This update improves upon that fix.
  
  
• Fixed a race condition in which the sort criteria popup menu in the Task History window wasn't getting populated if the task history window was opened very soon after launching CCC.
  
  
• Added "files copied" to the history output of the CCC command-line tool.
  
  
• When backing up to a disk image on a network volume, postflight unmounting of the network volume is now a little more reliable in cases where the diskimages-helper service is being stubborn.
  
  
• When CCC creates a System volume on the destination, the new System volume is now formatted as case-sensitive if the sibling Data volume is formatted as case-sensitive.

More info on Carbon Copy Cloner 5 (including 30 day trial) at bombich.com.