It can do full text search (subtitles, comments) right in the ui. It seems to be designed for large scale backups. I use it for a couple hundred important to me or likely to be removed videos and it works excellent, too.

Would have preferred a more unsurprising db like psql or SQLite for my usage, but they also support data dumps so if needed I can escape.

ES is just a Java-based server, isn’t it? Looks like it clocks in at 500MB which is on par with an Electron desktop app.