Backup .htaccess failure

When backing up the htaccess-file, I get the following issue:

htaccess backup failed.

Warning: copy(/www/htdocs/…/…/.htaccess.backup) [function.copy]: failed to open stream: Permission denied in /www/htdocs/…/…/wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-utility-file.php on line 49

Warning: fopen(/www/htdocs/…/…/wp-content/plugins/all-in-one-wp-security-and-firewall/logs/wp-security-log.txt) [function.fopen]: failed to open stream: Permission denied in /www/htdocs/…/…/wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-debug-logger.php on line 52

Warning: fwrite(): supplied argument is not a valid stream resource in /www/htdocs/…/…/wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-debug-logger.php on line 53

Warning: fclose(): supplied argument is not a valid stream resource in /www/htdocs/…/…/wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-debug-logger.php on line 54

I wonder what’s wrong.

http://wordpress.org/plugins/all-in-one-wp-security-and-firewall/