I am in the only if the poster is in need of it Camp, and no posters after 1980 should be backed, why waste the money just buy a better copy...
I am with you on this, Paul and am of the same thought. Post 1980 posters are so prolific that it makes zero sense to back a copy that has been ripped or damaged in some way. Just pick up another that is bound to come along.
I had 3 pieces backed-- a 1920's French one panel, a 1927 pre-war Belgian and a 1936 French (this one is an odd size--it measures about 27x39 if i remember). The one panel had some fold separations and the paper was brittle and needed to be washed, too, as much of the background area is white. I was afraid to unfold it multiple times to even look at it. The other french had weakening fold areas and needed to be de-acidified. The Belgian was delicate and printed on thinner paper. So my reasoning was from a conservation and preservation standpoint, only.
I had no restoration or painting done, leaving them as is. I just didnt want them to eventually fall apart, so opted to have them backed.
Jeff