Technically it was wrong but practically it was not. see: http://news.ycombinator.com/item?id=2606096 http://news.ycombinator.com/item?id=2606096 In particular

Technically it was wrong but practically it was not. see: http://news.ycombinator.com/item?id=2606096 http://news.ycombinator.com/item?id=2606096 In particular: "I trust Redis-on-disk every day less." --antirez (author of redis) which he then qualifies in the comments as some slim use-case where it makes sense to have redis persist data to disk. In short, it's not the intended use-case and you damned well better know what you are doing.