Are Snapshots backups? And what do you need to protect against?

I got the idea for this post from a Twitter thread. I thought such discussions were dead but clearly they’re not, and decided to shed some light on this, having dealt with backup at insane scale in a previous life.

It doesn’t matter what a feature is called – can you use it to recover? And, if the answer is yes, how quickly and under which scenarios? And what are the downsides?

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