This article is a thunderous warning of the importance of backup. In the early days of USENET I remember in one of the DEC newsgroups a question that asked how

This article is a thunderous warning of the importance of backup. In the early days of USENET I remember in one of the DEC newsgroups a question that asked how to recover an inadvertently deleted file on a PDP-11 on (I believe) an RSX-D environment. The response read: "First, mount your backup tape..."