HenryH asks an interesting question over in this post that deserves it's own post. I'll paraphrase is question as follows:
Do you delete files of unused images or ones that you have rejected for a project? What about ones that have technical problems?
There are various strategies about this and opinions abound. Here's mine.
I've never understood why it's a virtue to delete images we work so hard to capture. A few more boxes from Light Impressions to store my negatives is not going to break the bank; another backup hard drive is not going to make or break my financial security. On the other hand, I've had far too many occasions to count when I discovered an image in my archives was perfect for some use I did not anticipate when I initially rejected it.
Here's a great example: I made some 600 exposures of the cement walls over at Fort Casey, about an hour from where I live. I was so fascinated with the subject that I returned to it half a dozen times for daylong photographic sessions. Eventually, however, I concluded that the abstract images I thought I was going to make were simply uninteresting and I ultimately abandoned project. Thankfully, I did not delete the files. Years later, I needed some textured backgrounds for completely unrelated project. I realize these abandoned abstracts offered the perfect solution. Had I deleted them in an effort to economize hard drive storage space, I would've lost the opportunity to use them in this thoroughly unanticipated way.
Uses a cropped and adjusted version the wall abstract below as its background.
Another example: Twenty years ago my photographic work was targeted primarily for the single image. Like most photographers, I assumed my work would live in mat boards hanging on the wall — a paradigm with the single greatest image is the only one that is used. Now that I find myself working in multiple image formats like folios, chapbooks, and PDFs, I'm finding use for lots of images that wouldn't have succeeded as wall art. Again, thankfully, I didn't delete those files or destroy those negatives simply because I was interested in economizing storage space.
So, I have found it much better strategy to put time and energy into organization and proper storage rather than in applying the same time and energy to lightening the load. The only images I delete are the ones of the inside of my lens cap or the accidental misfire that captures a perfect portrait of my foot.