You want to save a backup copy of your IOS image on a TFTP server.
You can upload a copy of your router's IOS image to a TFTP server with the following set of commands:
Freebsd% touch /tftpboot/c2600-ik9o3s-mz.122-12a.bin Freebsd% chmod 666 /tftpboot/c2600-ik9o3s-mz.122-12a.bin Freebsd% telnet Router1 Trying 172.25.1.5... Connected to Router1. Escape character is '^]'. User Access Verification Password: <vtypassword> Router1>en Password: <enablepassword> Router1#copy flash:c2600-ik9o3s-mz.122-12a.bin tftp Address or name of remote host [ ]? 172.25.1.1 Destination filename [c2600-ik9o3s-mz.122-12a.bin]? <enter> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 11135588 bytes copied in 52.588 secs (211752 bytes/sec) Router1#
It's a good idea to save a copy of the current IOS image before attempting to upgrade the IOS version of a router. This way, if an upgrade fails or if you have problems with the new IOS version, you can revert back to the old proven IOS version. The procedure to copy an IOS image to a TFTP server is very similar to the way we backed up a configuration file in Recipe 1.2. The only real difference is the size of the file involved—IOS images are quite a bit larger than configuration files.
As we mentioned in Recipe 1.2, you have to verify the file permissions on your TFTP server. The transfer will fail if this file isn't world writable. We highly recommend that you remove the world writable attribute on this file after uploading it. On Unix systems, you can use the chmod command to change the file attributes. This will ensure that the file isn't accidentally overwritten. Unlike configuration files (which you should never store in your TFTP directory), world writeable IOS images pose no security concerns.
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