Don't necessarily assume that you have to output and then save most of your files. Just learn to use the right asset management tools from the beginning.
If one uses workflow management tools such as Lightroom or Aperture, the need to "save" an image as an file outside the tool, is much less. My file exports are only in response to output requirements: images destined for the web become jpegs; for outsourced printing usually TIFF or PSD in the aRGB color space; production houses like TIFF.
Once the image is delivered and fulfilled, I usually just toss the final file--no need to deal with all that. If you utilize virtual copies, snapshots, and version control in Lightroom it is very easy to export the same jpeg, TIFF, or PSD on demand, fulfill, and trash.
Of course there are exceptions--work with intensive Photoshop labor, or HDRs get saved and kept per above. But that's a very small proportion of the 100,000 images I manage.
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