An old article (of mine), but discusses the importance of having one-way backups (external link).
I prefer open-source software and have been a long-time advocate of OSS in general. Recently, I started liking WP Rocket plugin that offers some unique features. I already have a perfect Nginx configuration for WP Super Cache plugin (that I consider as the best full-cache plugin till date). Since, WP Rocket uses disk caching like WPSC, I wanted to quickly convert the existing configurations to fit WP Rocket. I did succeed in it and you can find it in my WordPress-Nginx repo. Here I explain how WP Rocket stores the cached content and how it could be integrated into Nginx.