An architect, leaving a building site, puts his laptop for a moment beside his car...

An architect, leaving a building site, puts his laptop for a moment beside his car on the road, while answering his phone. When driving away he sees in the mirror his laptop being crushed by an enormous lorry driving over it. All his files on the design of the building and the calculations he worked on are lost. His only consolation is that those were the only files on the device.

In terms of the GDPR, what happened?