A recent spate of ransomware attacks have derailed major corporations, spurring a fuel shortage on the US East Coast, shuttering grocery stores in Sweden, and sending students home from grade schools. The solution, so many cybersecurity experts say, is to implement backups.

But if backups are so useful, why aren't they visibly working? Companies with backups have found them misconfigured, or they've ended up paying a ransom anyways.

On Lock and Code this week, we speak with VMware technical account manager Matt Crape about backups, a complex defense to ransomware.