https://wordpress.org/support/topic/backup-is-to-big/page/3?replies=49#post-7467765
The problem was a server-side issue. DreamObjects Backup uses sql command line code to create DB Backups. The server did not have a relative URL path configured to mysqldump used in the code below in DreamObjects. The dump file was empty due to the script not finding and executing mysqldump.
$dbcmd = sprintf( "mysqldump -h'%s' -u'%s' -p'%s' %s %s --single-transaction 2>&1 >> %s", DB_HOST, DB_USER, DB_PASSWORD, DB_NAME, $tables_string, $sqlfile );