What if he reads his own comment? That would be covered by the admonition to read literally anything.
But my troll aside, I agree. If losing the data would cause you harm or make you sad (losing photos of your kids for example), you definitely need to have multiple backups in multiple locations, ideally controlled by different parties (so one bug on your cloud provider's side doesn't wipe out both of the copies they store for you). I've been burned by this with personal data a few times. The stakes get even higher when you are responsible for someone else's data. If they don't want to pay for the extra storage, make sure they understand the risk involved.
But my troll aside, I agree. If losing the data would cause you harm or make you sad (losing photos of your kids for example), you definitely need to have multiple backups in multiple locations, ideally controlled by different parties (so one bug on your cloud provider's side doesn't wipe out both of the copies they store for you). I've been burned by this with personal data a few times. The stakes get even higher when you are responsible for someone else's data. If they don't want to pay for the extra storage, make sure they understand the risk involved.