I come back from a shoot and download to the PC,go through them and delete what i dont want,PP the ones for posting.Then the raw files are filed in my system,the converted jpegs are stored in monthly/yearly folders,both sets of images are then backed up to a external hard drive,when it comes time to remove them from my computer to make space i back them up again to another ext HD.
They are never fully deleted when they are not on my computer any more they are on two ext HDs,storage space is fairly cheap now so i see no point in ever deleting them completely,besides its fun to look back sometimes.