This issue was raised at: https://stackoverflow.com/questions/47987538/redis-protected-mode-no-not-persistent-data-on-disk/47993722

Launching the server process with any command line configuration directive, e.g. redis-server --port 6379, causes the default persistence settings to be reset. Although this appears to be the behavior since forever,
https://github.com/antirez/redis/blame/0b561883b48db76a78497b1bebfd9367c80e2d96/src/server.c#L3851, it doesn't seem right.

Thoughts?