Persistant phantom volume mount points, how to prevent?
If you removed Carbon Copy Cloner by dragging it to the trash, I'm guessing there may be remnants of CCC still on your system.

Check these locations and delete them these if they exist:

/Library/Application Support/com.bombich.ccc
/Library/LaunchDaemons/com.bombich.ccchelper.plist
/Library/PrivilegedHelperTools/com.bombich.ccchelper
/Users/yourname/Library/Application Support/com.bombich.ccc