In the summers between college semesters (about 1970), I discovered that if I read a novel and don’t write anything down about it, in a few months or a year, all specifics of the story will fly out of my mind. Plus the things I did remember and value melded together but I couldn’t identify the source.
So, I started writing book snapshots, not reviews but notes that trigger in my mind what I found important in novels and non-fiction. When computers came around, I saved them and with the web I saved them on my website. That worked, but it involved programming and support effort which consumed time I wanted to use on other projects.
After a number of offers to join Goodreads, I finally joined a couple of years ago and found that it supported snapshots better than my site. Now I use Goodreads for my new book snapshots.
If I get desperate to time travel, I look at some old snapshots.
On Goodreads I see that I’ve read 36 books this year. In full disclosure, I have to admit that some books didn’t rate complete attention from beginning to end.