Tool to backup GnuPG secret keys on paperhttp://www.jabberwocky.com/software/paperkey
A reasonable way to achieve a long term backup of OpenPGP (GnuPG, PGP, etc)
keys is to print them out on paper. Paper and ink have amazingly long retention
qualities - far longer than the magnetic or optical means that are generally
used to back up computer data.
David Shaw (program)
Peter Palfrader (man page)