I love how this question is phrased, because it made me examine backing up — a topic I’ve written about frequently — in a completely different way. Instead of looking at just the tools and techniques, it made me consider trust.
In so many ways, all the tools and techniques are secondary to your ability to trust a backup. And trust itself can mean several different things.
Spoiler: I don’t trust any single method completely. Instead, I trust several methods a lot.