The first step I like to perform is based on a feature not found in photoshop - make a virtual copy. A virtual copy provides a good starting point to correct and modify an image and still have a copy of the original to view.
To make a virtual copy, just right click on a photo and choose virual copy. Notice that the copy has the bottom left hand corner turned up to indicate it is a copy. Also note that Lightroom automatically stacks the pictures.
Don't forget that virtual copies take little to no storage space because they are merely pointers to the original image. Lightroom's advantage to many programs is that it stores the steps necessary to produce the image, not the actual chanegs to the image. Multiple copies take up kilobytes rather than megabytes or gigabytes.
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