Thanks so much for the advice, Heather!
When I mentioned the non-archival quality of digital photography, I was referring to the upgrading that was needed every so-many years to store the information (cds and computer programs), in addition to the quality of the printed copies. In my day job, we use B&W photos because (when stored properly & when TRUE B&W film is used) they can have a shelf life of 75 years or more, thus more or less establishing a 'permanent record'. [National Register of Historic Places/National Historic Landmark photo policy] Whereas, computer printer ink and photo paper is not really archival, but ok for short-term use.
I suppose my question should be: should I look at photographing the collections as establishing a "permanent record' or just think about it as something that will probably have to be done again in 'x' number of years?
Denise