Hi,

a common mistake when building packages for backports is to forget the
-sa option to debuild, which results in a package that doesn't include
the .orig.tar.gz in the .changes.

I would appeciate a check for this in dput, which could probably be
implemented by checking for extra files in the current directory that
are not mentioned in the .changes file.

Of course, this could be implemented with a hook.

Greetings
Marc