Cisco switches/routers : automate configuration backup

Hi mates,
a customer asked me how to automate the configuration backup for the internal switches. There are some 2950, 3750 , 3560 and so on.
Unfortunately there are a lot of non-free solutions but searching a little bit deeper I discovered that Cisco provides at least two different ways to do this.
So first of all you have to identify the server that will host the backup files.
Second identify which protocol you want to use to send, over the network, the backup to the selected server.
In my situation I've choose TFTP. There's a free TFTP server solution from Solarwind that is simple and works.
I've explained, briefly, two different solution : Kron and Archive.

With Kron you schedule an action to be done periodically. Kron does accept only EXEC CLI commands and, practically speaking, you will configure two different processes : a policy (that includes commands) and the scheduling (specifying the interval).