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user_id=1115903

Oh, silly me, I didn't notice this: "3488210kB copied,"
which is of course >2GB (don't know if your number indicates
pre- or post-compression though). I'm assuming this means
that you're bumping into the limits of the zip file format.

Since this sort of thing happens occasionally in some
applications I maintain, I will look at making a patch for
ZipFile that will at least tell you when you exceed file
format limits (either individual file size or total archive
file size).