Interesting. I have not updated to 10.15.4 yet so I looked and I do not have /data/private/var/dB/lockdown under /system/volumes. Must be something from the update.
Lisa
His path leaves out the capital letters. It's actually "/system/Volumes/Data/private/var/db/lockdown" and CCC has not complained to me about it. I'm on 10.15.4.
Has CCC been enabled in System Preferences > Privacy & Security > Privacy tab > Full Disk Access?
I do not like to have automatic update