/var/lib/redis/
sudo nano /etc/redis/redis.conf
appendonly yes appendfsync everysec
check *.aof
ls /var/lib/redis/
References
https://blog.sensible.io/2013/08/20/setting-up-redis-for-production-environment.html
https://www.digitalocean.com/community/tutorials/how-to-back-up-and-restore-your-redis-data-on-ubuntu-14-04