Cisco IOS image(s)
Manage Cisco IOS
Before you upgrade or restore a Cisco IOS, you really should copy the existing file to a TFTP host as a
backup just in case the new image crashes and burns. And you can use any TFTP host to accomplish this.
By default, the flash memory in a router is used to store the Cisco IOS. I’ll describe how to check the
amount of flash memory, how to copy the Cisco IOS from flash memory to a TFTP host, and how to copy
the IOS from a TFTP host to flash memory.