Traditionally when transferring files to or from cisco devices we have been using tftp and lately https, however there is also another method. Secure Copy(SCP) is a secure way to transfer config and/or image files to/or from cisco routers and switches.
SCP works on SSH protocol on port 22 which is like an encrypted tunnel. This tool is very useful especially to transfer files for upgrades or
to perform safe backups.

The following versions have support for SCP: Cisco routers ver 12.3 and above & PIX/ASA firewalls 7.1 and above, FWSM 3.1 and above.

In order to configure SCP on your router or firewall, you need to make sure SSH is working.

command to configure scp on a cisco router
ip scp server enable

command to configure scp on a cisco firewall
ssh scopy enable

command to scp a file to cisco router or firewall
scp admin@:

command to scp a file from cisco router or firewall
copy flash: scp://admin@/

Sourced from Information Security Tips:

http://informationsecuritytips.com/2009/01/use-scp-with-cisco-routers-and-firewalls-to-transfer-files/