As a photographer, my images are important to me; not just when I take them, but for years afterwards, whether it seems that they have any future use or not. I can't count the number of times I've had a call, years after an image was taken, to see if I still have the file anywhere - often because one of the people in it has passed on, but mentioned that this was their favourite photo of themselves at some point.

Or, as has happened, when someone I photographed has won a major award - say, the Man Booker Prize - and suddenly, the world's media needs an image I took.  And, of course, sometimes it's just a matter of wanting to find something for historical purposes: that time someone performed here before everyone knew who they were, and so on...