when i said most of the time,
i was referring to work related image making
i usually have to submit 2 negatives and 3 contact prints ..
and have learned through experience it is good to have 1 extra
... using single step duplicating film is OK ( kodak stopped selling it,
and i have a feeling photowarehouse doesn't sell it anymore )
and contact printing a negative, and then
making a contact print of that positive is a PITA ... nothing is as good as the real thing,
it is just like making prints, i always make 1 or 2 extra because sometimes
"stuff happens" ...
from time to time with "personal work" i will make a second exposure as well ...
but it probably doens't record the same thing ...
for the folks who don't make back up exposures -
do you back up your computer, or just hope your hard drive doesn't fail ?