Greatest weight ever lifted (with good evidence)

It is widely reported that Paul Anderson lifted 6270lbs in a "backlift", but I have never seen a photo of this event and it seems that perhaps the story is exaggerated. So my question is, what is the greatest weight lifted by a human, for which there is irrefutable evidence – preferably including photos or video.

In response to a comment and to clarify further – I am talking about any style of lift. I do not care about how far the object is lifted off the ground. It could be just 1mm. This does introduce a problem, particularly for bulky objects (like cars) because you have to check very carefully that all four wheels are off the ground at the same time. So the refereeing of the lift must be strict for the record to count. I would expect the heaviest weight lifted to be way way more (2x? 3x?) than simply the world record squat.