As I didn’t know the Edis project existed, and had to google for it - here’s a link: http://inaka.github.io/edis/

It’s summary is: Edis is a protocol-compatable Server replacement for Redis, written in Erlang. Edis's goal is to be a drop-in replacement for Redis when persistence is more important than holding the dataset in-memory.

And so I don’t have to hijack this thread a discussion: https://news.ycombinator.com/item?id=5621574