I would recommend keeping the originals personally. They are like the negatives from your camera. The JPEG edit is destructive so you can't ever get back to the original. You could put them on a DVD or external drive or something.
^^^ This. Keep your RAWs. If you don't feel like processing RAW every time, shooting RAW+JPEG mode. Storage is cheap.
Recently I grabbed a couple RAW files from a trip
ten years ago to make large acrylic prints.
If I'd thrown away the RAW files I'd have been stuck with the lesser results from ten years ago instead of the superior results I achieved by reprocessing the files with modern software tools and techniques (as well as my greater knowledge of these tools today).
The bigger problem is that people tend to machine-gun their camera and don't cull the crappy or mediocre images. I'll make two passes; first pass is shortly after the event or trip where I mark the keepers, delete the crap, and leave the maybes. Then I'll make a second pass a couple months later to re-review the maybes to decide what really needs to stick around and delete the rest. This practice will save you far more disk space in the long run than deleting RAWs and keeping five dozen nearly identical jpeg images of your cat licking himself.
