Mister E
Well-known
If you get an electrical failure and blow the controller--- and its more common than any of us are comfortable thinking about--- you can blow all the disks. YES, I've experienced it.. FIRST HAND.. No urban lore.. Its real... and after telling the story to a customer at a research institute.. a few months later.. he experienced same.. In our case we just lost our spider's cache--- we were indexing the Internet.. He lost his accounting db.. Cost him many $1000s of USD to get the data out by a team of elves in Norway.. and was quite happy... VERY happy.. The damage could have been many many times over that amount.. Nope.. RAID is no answer to the question.. Neither is DAT, Tape, DVD, CD etc.. MO was about as close it came but still not the solution..
The problem is the mode of failure.. When a negative gets damaged you loose some information but its not all lost. With digital the mode of failure is complete. Throw in the density of storage and its nothing short of a ticking bomb.. its not "if" but when the information is lost..
A man drops two items into a fire. A page of negatives and a hard drive with 36 digital shots on it. The negatives are quickly consumed while at worst the HDD is unrecoverable it may survive the fire. It would then be possible to recover the 36 images while the negatives are gone forever. One week before this the man put all 36 of his digital images on a CD to mail to his client. His images still exist at exactly the same quality and are recoverable.
Baring TNW or an EMP digital needs more redundancy, but has more security as long as there is software to read the files, which lets face it. JPGs aren't going to be unreadable anytime soon.
Film on the other hand is unique. You can make an analog copy of it, which will not match the quality of the original slide or you can make a digital copy of it, which then takes the same pathway as a digital file from a digital camera. If the negatives and slides are destroyed, which has happened many times over the years to catalogs of many famous photographers, that's it. There's no bringing them back. There no chance of having them backed up.