The recent floods in Brisbane highlighted to me how we always need to be prepared for low probability-high impact events. So I went out and bought a second hard drive for backup. I realised that having a laptop and backup in the same location is not sufficient. Fires, floods, and theft do happen. So don't just back up now. Get a second one in a different location. Furthermore, the earlier you are in your career the more important this is. Losing your thesis or all your data is the worst thing that can happen.