i think it is GOOD to have a backlog.
time sometimes helps images that might have fallen through
the cracks of a proof and later final print ... rise to the surface.
i have gone back to images years later and realized that there was one
or two that i overlooked. they weren't the images that fit my state of mind
back when i proofed and printed the final images ( i didn't always have a 9 year backlog! ).
i guess what i am trying to say is don't be in such a rush