64733: Acronis True Image 2020 (Mac): Backup fails with "Failed to enumerate directory 'Macintosh HD — Data:/private/var/db/lockdown/" after update to macOS 10.15.4

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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.

Solution

This issue has been fixed in Acronis True Image 2020 Update 3 (Build 25760), please update to the latest build. Starting from this version, folder /private/var/db/lockdown/ will be automatically skipped.

If you cannot install the latest build for some reason, as a workaround, exclude folder /private/var/db/lockdown/ from backup:

  1. When configuring a backup, click Settings, and then click Exclusions;
  2. Click the Plus sign to add a new exclusion;
  3. Most likely the folder will not be present in the list as it is hidden by default. Press the Command + Shift + . (Period) keys at the same time to show the hidden files and folders on Mac. Browse to the folder /var/db/lockdown/, select it and click Exclude.

    Press the Command + Shift + . (Period) again to hide hidden folders. 

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