Periodic upload of router configuration

from http://blog.ioshints.info/2007/08/sample-configuration-periodic-upload-of.html?showComment=1239216120000 we read this solution:

To get an IOS device to upload it’s configuration periodically to an external FTP server:

ip ftp source-interface loopback 0
ip ftp username ftp_username
ip ftp password ftp_password
file prompt quiet
!
kron policy-list backup
cli copy running-config ftp://10.20.30.40
!
kron occurrence daily-backup at 0:30 recurring
policy-list backup