Fun anectdote. Many years ago, I had all my photos and other personal documents encrypted in a PGP Disk on a RW-DVD, and did not store the password in any digital form, because that was the most secure thing to do. Some time later I forgot the password, could not find where I had written it down, and to this day have never recovered them. (Don't have a DVD reader anymore either, though I could still get one of those.) Lesson: don't forget your encryption key.