For any device used by the police the manufacturer should have to prove that the device has a failure rate of zero. If the device gives any false positives then how can it be trusted, somebody is going to be convicted who shouldn't have been. Has anybody heard of the story of a speed gun measuring a wall traveling at 40MPH?

I've been using windows live mesh (www.mesh.com) to achieve this. I have my work machine and my home machine setup to synchronise files. This way I always have two copies of the files on two machines, with a third copy stored online. My wedding photos might actually be safe now.