I have a separate installation of Shaarli to keep track of my books. I have a slightly modified Shaarli theme to make it fit the use case a little better.

Check out Pepperminty Wiki, it’s about as simple as they get.

Everything I self host I use each and every day (every other day, if I’m busy). I don’t keep stuff hanging around just because.

Offsite backups.

Check out Pelican, it might be closer to what you’re looking for.