If you are using traditional Tape drive backup systems in your organization; consider the following hypothetical situation:
There was a fire in an office and the Tape drive with the most recent Full-backup was damaged beyond repair along with the server. Luckily, the Business Operations manager had an older Tape drive at home, but it was two weeks old.
The situation described is frightening, but it could happen to any organization. Typically, all organizations using the Tape drive backup method keep some Tape drives off-site, but the data on those Tape drives is rarely the latest. In the hypothetical situation above, two weeks of data is lost forever.