Same deal here, we'd been backing up the servers to tape and dutifully boxing and taking one set offsite. Finally someone deleted something by accident and that

Same deal here, we'd been backing up the servers to tape and dutifully boxing and taking one set offsite. Finally someone deleted something by accident and that's when I discovered you should verify that you can read the tape once in a while. Fortunately, not an important document, but that was just luck.