As I understand it the DNG will contain all info that the CR2 does and is just as useable a file type. You must be using up a lot of hard drive space saving four copies of each photo. I only keep my raw files on my PC. I use Lightroom for editing my RAWs and it saves a sidecar file with any editing that I have done. That way I can go back to the raw and either tweak my editing or output jpgs or tiffs as needed.
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