Not an idiot but human
I remember finishing off a long report for a child in care that was due to be handed out at a core group meeting the next day, as all the rest of the team were on strike (I was working for an agency) I enjoyed the time getting stuck in...then, my boss brought me a coffee and cake and I accidently pressed delete instead of save so deleted the lot...no back up and I had not saved any of it!!! Thankfully I did remember most stuff so started again...lesson learned for me!