If I ever initiated backup procedure that also involves filesystem backup, the backup will always failed with the error message below:-
A database operation failed. Please try reinstalling the plugin - in most cases this will repair the database. Please contact support if the issue persists, providing the complete event log for the activity. Error information follows: Location: 862:<path_to_wordpress_install>/wp-content/plugins/wponlinebackup/include/files.php Message: WPDB error: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='. Last query: UPDATE <code>wp_wponlinebackup_items</code> SET new_file_size = 262, new_mod_time = 1296370500, backup = IF(<code>exists</code> IS NULL OR file_size != new_file_size OR mod_time != new_mod_time, 1, 0) WHERE bin = 2 AND parent_id = 1 AND type = 1 AND name = '????????.html'
If I were to do only a databse backup, it will succeed. If I were to do either filesystem-only backups or filesystem+database backups, it will fail.