bloating of the main ftp mirror in the "distfiles" directory...

Hi, I was wondering as to why (apparently) duplicate files are being
stored on the main ftp server for OpenBSD.

Specifically, the question concerns the "distfiles" directory where
various (largish) files in addition to being present at the
"distfiles" level are also being duplicated in the "md5" subdirectory
of "distfiles"...

For example, the following two files appear to be identical (i.e.
running "cmp" on them yields no differences):

ftp://ftp.openbsd.org/pub/OpenBSD/distfiles/gnome-applets-2.8.2.tar.bz2

ftp://ftp.openbsd.org/pub/OpenBSD/distfiles/md5/10d83b6e031bad31d7cfefe2c4884bd7/gnome-applets-2.8.2.tar.bz2

Is there any reason for this to take place?

And, more importantly, is it possible to skip "distfiles/md5" and
"distfiles/sha1" sudirectories when mirroring the ftp mirror (i.e. so
that I would still then be able to make ports from sources without
having to download the duplicate files in the md5/sha1 dirs) - I am in
a process of mirroring the "distfiles" directory (current Internet
connection allows me to do it at no charge and rather "quickish",
whilst in a near future this will change - so I am "caching up" the
bulk of data to save me money and time when I get to installing
OpenBSD and playing with it more and more)...