Sorry I accidently replied to the previous resolved post.
I installed your latest version 402 and still got these errors:
30th Oct 2012 6.21.05 PM Error The backup failed: A database operation failed.
30th Oct 2012 6.21.04 PM Error 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. Diagnostic information follows:
Failed at: 1123(/home4/routersf/public_html/ARMEDPIRACYDEFENSE/wp-content/plugins/wponlinebackup-402/include/files.php)
WPDB error: <WPOnlineBackup Internal Error> Row was inserted but not selected!. Last query: SELECT counter FROM wp_wponlinebackup_items WHERE bin = 2 AND parent_id = 3971 AND type = 1 AND name = '??????_11.wmv'
Also I re-installed the plugin and still got this error. I also received this warning:
30th Oct 2012 6.30.33 PM Warning Table 'wp_cf7dbplugin_submits' has no PRIMARY or UNIQUE key! Backup of this table may be inconsistent; some rows could get missed. See FAQ for more information.
I never had this warning until I upgraded to the 2.2.9.