The very first "computer guy" job I had starting in about 1990/1991, my mentor gave me a piece of advice that I remember to this day: "Your job is to make sure the backups are working; everything else is gravy."
While I worked in that job, we outgrew the tape backup system we were using, so I started replicating critical data between our two sites (using 14400 bps Shiva NetModems), and every month I'd write a memo requesting a working backup system and explaining the situation. Business was too cheap to buy it.
We had a hard drive failure on one of our servers, I requested permission to invalidate the drive's warranty because I was pretty sure it was a bad bearing; I got it working for a few weeks by opening the case and spinning the platter with my finger to get it started. I made sure a manager was present so that they could understand how wack the situation was- they bought me a new drive but not the extras that I asked for, in order to mirror.
After I left that job, a friend of mine called me a month later and told me that they had a server failure and were trying to blame the lack of backups on me; fortunately my successor found my stack of memos.