With all of the photographs we tend to take with our digital cameras/phones, its tempting to just choose a few "keepers" and then ignore or delete the remainder. I use Adobe Lightroom's star rating system, and usually pretty quickly delete those that get "no stars," which are often out of focus, repetitious of other photos, or have other insurmountable problems. I then focus on the 4's and 5's and ignore the remainder, with the temptation to delete the 1's and 2's at some point. BEFORE YOU DO THIS, go back through the 1's and especially the 2's and see if you're missing something. Don't do this immediately after the initial ratings; waiting six months, or year or more, before looking at the photographs afresh.
I started working on a self-published book on my Cuba trip of two years ago and realized, after looking at the 4's and 5's that I was missing the full story of my trip. So I expanded the search to the 2's and 3's and was surprised at what I found this time around. Sure, most deserved to remain "in storage." But a fair number, especially with some adjustments in Lightroom became 4's!
So whether you are looking for photos to illustrate a trip or a person or an event in the past, don't forget to recheck some of the "backup" photos; you may be pleasantly surprised! And some of the surprise may be a result of changes in your "vision" of what a good photo is.
The original on the left; the new (greatly increased exposure among other changes) on the right. I like the stark look versus the silhouette. But to each there own!