Back up everything! You are not invulnerable. Catastrophic data loss can happen to you - one worm or Trojan is all it takes.
The estimated loss of up to six million dead is founded too much on both emotional, biased testimonies and on exaggerated data in the postwar reckonings of war crimes and on the squaring of accounts with the defeated.
Data is not information, information is not knowledge, knowledge is not understanding, understanding is not wisdom.
Success consists of going from failure to failure without loss of enthusiasm.