A tale as old as time
Way back in Jurassic times, developing on mainframes, a smart girl *coff* asked if our relatively new environment which had been set up for a new project was included in the schedules which backed everything up to tape*. We checked, it wasn't, so our semi-technical team leader raised the paperwork, then said he would work late to "tidy things up" before the first backup as we had been so productive that the first back up was likely to be quite large.
You can guess how this went, can't you?
Fortunately, we had enough compilation listings to allow us to re-type it all back in within a week.
* Proper tapes, with Joe 90 reels, vacuum feeds, reel clips that broke when hit by footballs (another story for another time), with tape accessible to grumpy tape ops who were not above giving it a tweak to stretch it and render it unreadable 2 hours into the batch run if you'd pissed them off.