It used to be you could find a box of photos or keepsakes that you inherited to look back on how things were or when you were a kid. Now, most of that is stored on phones, and most parents probably don’t think to share or save them in a way to be passed down in the future.
As someone who had to go through my mother’s and grandmother’s boxes of photo albums after they died, I can tell you that what people should be doing now is backing up select photos AND adding a full description in the files metadata. The vast majority of the photos in my mother’s and grandmother’s albums meant nothing to me because the context and history of those photos died with them.
Aside from adding metadata for those you leave behind, you should make it a personal habit to go through you own old photos you have backed up. Those photos true value is not as a legacy but as means to remember as you get older. Life is long (hopefully). The amount of life you forget is staggering when you remember it.
Fwiw I’ve found digikam to be a very nice tool to help with editing and writing metadata directly to photos.
It’s Foss and available for all OSs. Mainly helps because you can point it to a directory and highlight many photos and tag the same person, etc etc. It’ll keep a list of tags to add as well. Unreal for the price of free but recommend donating of course.
This here. Another thing to do is if you are taking video of family moments, narrate in the background what’s been going on for the past few days or a week. It adds additional context that is invaluable and would most likely be lost to even the person filming.