Using Photoshop Smart Objects is a great way to work non-destructively. You can embed a Smart Object directly in a Photoshop file or link to a separate file and update it and reuse it in multiple projects.
I recently had a co-worker ask what they were and why I use them. I had a difficult time explaining it, so when I came across this video tutorial, I quickly fired-off a link. It’s a great walk-through for those who’ve never used them.