Out of curiosity, I just tested WordPress 4.4.2 with the SQLite plugin.

Including download time, it took less than 5 minutes to get it working. Instructions are simple and easy to follow.

For fun, I also installed phpLiteAdmin, which allows phpMyAdmin-like access to your DB. Installing/configuring this added about 1 minute to my total investment of time.

The advantage is that everything you need to back up is in one folder. There is no daemon for SQLite, so there *should* be a reduction in memory usage too.

Links:
WordPress: https://wordpress.org/download/
WP SQlite plugin: https://wordpress.org/plugins/sqlite-integration/installation/
phpLiteAdmin: https://www.phpliteadmin.org/download/