This is the number one questions I get asked with regards to memory cards. When do I erase my pictures from my memory cards?
The answer is short: When I have at least two copies of every images that is on the card. In reality, whenever I return from a photo shoot, I import the card(s) I used into Lightroom. As part of the Lightroom import, every image is copied to a “workspace” which resides on a RAID-1 external drive which consists of 2 physical disks (a Western Digital MyBook Studio Edition II, to be precise). In addition, Lightroom places a copy of every original onto my Drobo
which is attached to my file server. Thus, I create 4 copies ever time I import an image.
Then, and only then, do I format my memory card. I never erase any picture – I just put the card back into the camera and then format it in-camera. That way, the card is freshly formatted and ready to go the next time I grab my camera.
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