Next time, don't put all your eggs in one basket. Smaller cards and frequent rotation is the secret,
Good advice, mixture. Slightly OT but a short while ago my sister physically lost the large card from her camera. It had
all her pictures on it, only a few had been downloaded to her machine (she hates computers).
My suggestion, too, was use a number of smaller cards to limit the loss.
Mark, hope you manage to recover your files.