You still have the problem that the data stored on the hard drive is almost certainly not compensable, and even if it is, the value of it is mostly sentimental. It has little to no market value. The law does not compensate you for sentimental value. If the insurance is paying for the value of the hard drive that is likely all that you would get if you sued. And there is the potential problem of contributory negligence: had you taken the simple precaution of backing up that data, it would not have been lost. That is what most ordinary, prudent people do with data that is important to them.