I sold my Berkeley house last year. It's the second time I sold a house. Each time I sell a house I fork off a storage unit. It happened the first time, when I sold the house in Woodside. I was spending $300-plus per month to keep the stuff I hadn't sorted through to figure out what I absolutely had to hold on to.
The second time, with the help of a friend, I did the sorting-through process, and this storage unit only costs $45 a month. The stuff I absolutely couldn't bear to part with were mostly notebooks and letters and a big box of unsorted photos. In the box, photos of friends and lovers, children and family members, most of whom are long-gone. Even if they aren't gone, our youth is gone. Memories that, even writing about, make me emotional.
Ask Kodak. They made a huge business out of these emotions. Now it's Canon and Apple.