I have a Debian box with nginx webserver, hosting a webmail interface. The server worked fine for a a while. Today I started to get 404 errors when pointing to home page. All of the files on the root partition are missing, except nginx log folder and files ( /var/logs/nginx) that are newly created. Any help is appreciated.
Update 1: Please note that all the files and folders in / are gone. No history or log exists. nginx logs just record the 404 errors of deleted pages.