I know there is commands to make a Kron job on a router to backup the configuration every day, week or month. Is there a way to do the automatic backup every month, but each time specify that it change the end of the file name to the date that it is doing the backup?
I'm afriad the "maximum" works only if you save the files to the router Flash, not to an FTP server.
you can automatically save your config to your FTP server any time you save your running config into the start-up one.
This way you'll keep all config versions on your FTP server (the file name will end with -xx = version number.)