Five Minutes that Can Save You hours...
In sum, this video says:
1 - Set up a folder structure (Click here to download one that we started for you)
2 - Keep that entire structure duplicated on a separate drive and/or a cloud-based back-up service. We became an affiliate member with BackBlaze.com after extensive research that led to my own peace-of-mind satisfaction. One tip... Connect as many external drives to the one computer you add the service to, and you'll get duplicates of those duplicates in yet another safe place. (We had our own horror story of both a computer and it's back-up drive failing at once).
3 - Have a working copy of your Portrait files in your folders, separate of the originals.