I'd like to convert my NEFs to DNG, for two reasons: (a) future-proofing, (b) to save space. The DNG files are slightly smaller than my NEFs and cumulatively that should save me a lot of space. Obviously with (b) in mind I would not be embedding the original raws and I would be deleting the original NEFs after conversion. Before I cross this digital Rubicon is there something I should know? Is there information in the NEF that won't be carried over to the RAW? Or is the smaller file size down to compression alone?