http://www.panix.com/~vidipax/
There is a list where questions such as this come up often. It's the
Association of Moving Image Archivists listserv (AMIA-L). Sub info:
To: listserv@ukcc.uky.edu
Body of msg: Subscribe AMIA-L firstname lastname
And be sure to check out the list's archives on care and feeding of
videotape.
Henry K. Mattoon
National Moving Image Database
The American Film Institute
Los Angeles, CA
213.856.7702
hkm@crl.com