An anonymous reader left an interesting comment on my post Sample configuration: periodic upload of router configuration. Instead of configuring file prompt quiet to avoid prompts generated by the copy running-config URL command, he recommended using show running-config | redirect URL.
The solution is almost perfect, but includes two extra lines in the router configuration …
Building configuration... Current configuration : xxxxxx bytes
… that you’d better remove before using the configuration on another router. The more system:running-config | redirect URL command removes even this minor glitch and can be used in both kron commands or EEM applets.