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Question:
How much resolution is enough or too much for scanning in slides and non-digital x-rays? The more the better? Is it like digital cameras and past a certain point doesn’t really make any difference?
Answer:
The answer is…it depends. If you are never going to print them and just display them on a monitor, LCD projector, or web page, 1024x 768, or under a megapixel is enough. If you are going to print them, how big? A 4×6 print requires only a megapixel or two. A poster size print could use all your scanner has to offer.

On the other hand hard disk drive space is cheap and back up systems are capable of handling large drives. Don’t discount forward compatibility as monitor resolution gets better.