Yeah I also want to know this, I used to write diaries for years and cherish it, thought I would look back my life or extract something meaningful out of it, turns out I very rarely look at it.

Same goes to old project archives, emails, I have both HDD and S3 Glacier for them, but so far I have never looked at them at all, for 10 years, And I doubt I will look at them in another 10 years.

I am beginning to thinking Letting past go and You aren't gonna need it philosophy towards such things