How to backup your keys.
gpg2 --export --armor CCCCCCCCCCCCCCCC > pubkey.ascii
(including private part, probably what you are looking for)
gpg2 --export-secret-key --armor CCCCCCCCCCCCCCCC > fullkey.ascii
An exported private key, e.g. stored on a USB stick is unprotected if you loose they storage media. You can encrypt and decrypt the backup file with a simple password via:
# encrypt with password gpg -c fullkey.ascii # generates an encrypted fullkey.ascii.gpg file rm fullkey.ascii # descrypt with password gpg -d fullkey.ascii.gpg > fullkey.ascii # generates a decrypted fullkey.ascii file
(for keys moved to smartcards)