directory

Symptoms

After updating to macOS 10.15.4 backups fail with the following error:

The last backup has failed. Failed to enumerate directory 'Macintosh HD — Data:/private/var/db/lockdown/'. It may be corrupted or does not exist. Please check the disk for errors.

Cause

Catalina update 10.15.4 restricted access to folder /private/var/db/lockdown/ for security reasons.