Backups, what backups, Oh, that one...
Back in my PFY days (it was the 70's, forgive me), we were going to (eventually) upgrade the OS to the next version. A few months earlier we had ordered some more memory (expensive in its day) and I knew that the old (currently running OS) would upon seeing this new memory would use it, and since the new OS took more memory (but not as much as the add on we had just purchased) I decided to patch the current OS to limit its scan of memory and just use the fixed size of the existing memory. Fast forward to the installation of the memory, and I chime in "see, we need the new OS to use the added memory". I was hoping to get it installed because it had nice features I liked.
Well, the powers at be decided that it would take training to get users up to speed (not really, but OK), so the installation was delayed a while. A little while later while experimenting, I wiped out the old OS, and being a good guy, and not knowing where the backup system tape was (or if it existed), just loaded up the new OS. Posted a few instructions (actually pretty simple ones) and left for the day (it was late).
Surprise surprise, I come in the next day and tell what happened, and was asked why I hadn't used the backup tape (it was in a filing cabinet, safe keeping and all that). It was handed to me and I looked at its date, which was before I had
buggered up patched improved the OS to only accept the old memory limits. OOOPS!!
I reloaded the old OS and everyone wondered why they had more memory. I flustered a bit and said, well the new operating system was MUCH better!!
Eventually we did go to the new OS, but I did a whole lot of dancing that day.