If it is lower than v3.0 of WordPress, we did actually break it, sorry!
If you go to Plugins -> Editor. In the top right, change the "Select plugin to edit" to Online Backup for WordPress. Then click Select.
In the Plugin Files list, click wponlinebackup/include/admin.php.
Very near the top, just scroll down a little bit, you'll see the following. Change the bit in bold from export to import.
/*private*/ function Admin_Menu()
// Add a menu item to the Tools section.
$this->page_hook = add_submenu_page( 'tools.php', _x( 'Online Backup', 'Page title' ), _x( 'Online Backup', 'Menu title' ), '<strong>import</strong>', WPONLINEBACKUP_FILE, array( & $this, 'Print_Page' ) );
// Add the page loader
add_action( 'load-' . $this->page_hook, array( & $this, 'Prepare_Page' ) );
This should fix it. Let me know if it doesn't.