First week in the job and I was told to update an intranet page. Opened it in notepad, made the change and saved it.

Turned out it was a SharePoint site and saving it in notepad broke all the links and turned it into a static page. Even worse, it was the homepage of the intranet.

I blame lack of training and, in hindsight, how awful SharePoint is.

Anyway, at least we successfully tested the backup process...