You might need to tell them what juristiction you are inquiring about. I bet it varies by country and even state. But I don't know enough to bet much. :)
The camera adds a thousand barrels. - Steven Colbert
Backing up dusematic, in federal courts the best evidence rule is pretty much a non-issue. Check out federal rule of evidence 1003:
Quote
Rule 1003. Admissibility of Duplicates
A duplicate is admissible to the same extent as an original unless (1) a genuine question is raised as to the authenticity of the original or (2) in the circumstances it would be unfair to admit the duplicate in lieu of the original.
Unless there is something pretty fishy going on, the duplicate is fine. (At least) most state courts follow the same rule, but I hardly ever practice in state courts so I'm not the best person to ask on that one.
This post makes me want to squeeze into my badass red jeans.