Backup restore completes with the warning on Plesk server: “Not found in archive”

Symptoms

The backup restoration completes with the warning under Tools & Settings > Backup Manager 

Error log: Warning: Restore hosting "example.com"
 Can not deploy content of domain example.com
 Warning:
 Archive error:
 Unable to extract files from /var/lib/psa/dumps/domains/example.com/backup_userdata_1811011003.tgz to /var/www/vhosts/example.com:
 /bin/tar: httpdocs/index.html: Not found in archive

Cause

The /var/www/vhosts/example.com/httpdocs/index.html file is missing in the backup archive.

This happens, when during the backup creation some files are removed. Thus, they exist in the configuration file but missing in the backup as itself.

Resolution

Restore the required files from another backup.