While tape is a good way to go, there are other GOOD options.
From the description or your set up a Drobo may be a good option. The Drobo is more then just a hard drive, it offers data redundancy on the device as well as the option to expand the drive capacity at a later time. In addition when compared to other raids you do not have to use the same make and model drive in every drive slot.
http://www.drobo.com
The regular Drobo and the Drobo Pro are both great options for safe data storage.
As was mentioned it is also good to have a copy of everything at another physical location, the Drobo also makes this quite simple. When combining the Drobo with the Drobo Share and then using the Drobo App Drobo Rsync (yes the Drobo can actually run special apps on the Drobo) and a second Drobo with Drobo Share at a Off-Site location you can sync the two Drobs. With a set up like that everything you put onto your Drobo is also safly stored at another location.
Unfortunately the data rates of the Drobo are not quite up to the speeds needed for proper video editing performance they are built for smart redundancy not for supper speed. BUT THEY ARE BREAT FOR SAFE DATA.
There are no "technical solutions" to your "artistic problems".
Don't let technology get in the way of your creativity!
