This is another excellent article from Trevor Pott. As usual, he gives enough background to understand where he's coming from, and presents new material in a way that's both readable for all and technical enough to really learn something.
Ah, Retrospect! I used it for 10 years. Its manual from 1996 is still my gold standard for product documentation. Inside the cover was written something like "Most people don't read the manual until they have a problem. If you need to restore data, turn to Chapter 7, page 82."
After managing backups at a few companies, I've developed 2 informal rules:
2) Nobody cares about backups; they care about restores. Think of it as "restore software" and much that is muddy becomes clear.
3) "You have a backup? Okay, point to it. Can you tell me what's in it?"
P.S. Rule 1 is, as always, "If it's not backed up, it doesn't exist."