My wife and I each have "partner sharing" setup in our Google Photos accounts so that we both have all of the photos in our own accounts. One could probably mak

My wife and I each have "partner sharing" setup in our Google Photos accounts so that we both have all of the photos in our own accounts. One could probably make a second account just for backups and setup partner sharing for this purpose. You can only have one account configured this way though, so choose your real partner or a backup account. We also back up to Amazon Photos as well, just for extra peace of mind.