Almost no company backs up all its critical data and tests that those backups really work. Backup software is incredibly complex with hundreds of options and a spotty record of actually working. The people who do even very limited in scope testing make up 1% of security professionals. The other 99% dont test backups at all. We are lucky if they read backup exception reports of the stuff that the backups didnt back up. The answer is often that those active files and programs cant be backed up correctly.”]