Package mpack is required in order to extract the backup contents.
# apt-get install mpack
# zcat /path/to/backup_file > backup_file.mime
# munpack backup_file.mimeThe result is a set of tar and sql files that contain domains’ directories and databases. Untar the directory as needed.
For example, to restore the httpdocs folder for the DOMAIN.TLD domain:
# tar xvf <DOMAIN.TLD>.htdocs