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I have only 2 copies but I have to do what Jeff has said as in moving one copy out of my home to another place like my daughters and then do as said, swap them over time to time to update them with the new shots taken. I am only a hobbyist at this as I never set out to make money from it but as we all treasure what we have got and taken we have to have these safe guards in place. Even if these are not up to others standards they are up to our own

What you have said is how I come to the thinking of back up as I lost a heap of shot due to them being only stored in one place. I plugged in my one and only harddrive and it would not open. Lucky for me in a way as a computer shop here was able to retrieve some but not all. I think it was about 30% of shots on it. And the cost was what I would of needed to buy another back-up External Harddrive. So my lesson came the hard way.

It would be good if they could tell you in a rough way how long these things will last for but then I think it depends on the usage of it, though this is only a guess.