Backup Error v2.1.1

Hello,
I can’t backup. I’m getting error:

Warning: set_time_limit() has been disabled for security reasons in /var/www/virtual/millesabords.net/htdocs/blog/wp-content/plugins/backup/backup.php on line 362
There appears to be an unauthorized attempt from this site to access your database located at http://millesabords.net/blog. The attempt has been halted.

Any help welcome.

http://wordpress.org/extend/plugins/backup/