How to track user actions on the server side?

What's a good tool for tracking user actions and product events on server side?

I wonder if there could be something more convenient and featureful than doing structured logging with an ELK stack. I'd love to have stats/graphs of things like 7d active users, churn, etc based on server-side submitted events.

Would mixpanel or segment.io be good for this? I never used those. Something else?

Something made by an indiehacker would be cool, too - if it has a data backup feature :-).

Thanks!