I'm trying to backup my config using the script from:
https://doc.pfsense.org/index.php/Remote_Config_Backup
(the one for pfSense 2.0)

The login command works ok, the cookies.txt file gets created. The second one works also, but when I check the contents of the config-router-… file, it appears that what gets saved is the diag_backup.php file. Here's an excerpt from the downloaded file:

   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

                <title>Login</title>

.....

Here's the second command I use:

wget --keep-session-cookies --load-cookies cookies.txt --post-data 'Submit=download&donotbackuprrd=yes' https://myserverhostname:81/diag_backup.php --no-check-certificate -O config-router-`date +%Y%m%d%H%M%S`.xml

I am using port 81, as this is the port set up on the web interface. The link works in a browser.

Has the syntax changed with 2.1, or do you have any ideas on what I am doing wrong?

Thanks