[unicornporn]

I almost went with MediaWiki, but ended up with DokuWiki. The fresh install of MediaWiki is 154 MB (!) and it's not exactly lightweight. DokuWiki is 10.9 MB and all content is saved in plain text files. Very attractive.

However, backlinks are not possible without hacks. A wiki without backlinks is kind of lame and I could very well use my good old plain text files.

Have you run in to trouble when updating MediaWiki, or is it smooth sailing? SQLite is not mentioned here: https://www.mediawiki.org/wiki/Download

[splitbrain]

What do you mean by backlinks are not possible? Do you mean in DokuWiki? Each page has a "What links here" button that shows backlinks - that feature is builtin.