Is there any reason why I should not delete unwanted File History files, which occupy several Gigs of much needed storage? Not only are many of them now redundant, large numbers were not wanted in the first place. An example of this is numerous jpeg images of music album artwork which I had no intention of downloading but were saved automatically when searching online music. Another is discarded photos and video clips, which were not deliberately saved because they were unsatisfactory. Why would one want to keep dud photos? And of course there is a great deal of duplication too.
It does not seem that File History backup is compressed, hence making the wasted space worse.