DV and MiniDV camcorder tapes can be used for more than just storing audio and video recordings. If you have a camcorder and a FireWire connection to your computer, you can also use them to store files.
Using DV tapes for data storage has its advantages. A 60-minute tape, in Short Play mode, can realistically store about 10GB of information at a speed transfer of around 3MB/second, while in Long Play mode it should be able to store about 15GB. Besides that, moving files to a DV tape is a good way to hide sensitive data, because few people would look there for that kind of information.