Stupid restore question

Trying to affect a restore. This is run from a host called "arwen" (my
backup server), the backup is from a host called "simon" and I am
trying to restore it to a third host called "simonback"=192.168.1.222
(which has the same hdup.conf as "simon")

hdup -c /etc/hdup/hdup.conf restore simon 2004-05-16 /home/restore @jamie-Q0ErXNX1Rubxw0KMbGF/[email protected]
hdup: simon: STARTING RESTORE.
jamie-Q0ErXNX1Rubxw0KMbGF/[email protected]'s password:
/usr/local/sbin/hdup: simon: STARTING BACKUP.
mkdir: cannot create directory `/backup/toarchive/mysql': No such file or directory

.. so it appears to begin restoring, and then it says "starting
backup" and the prerun.sh script fails since it doesn't make sense for
this restore. prerun.sh starts with:

#!/bin/sh
if [ "$1" == "restore" ]; then exit 1; fi

How come it thinks its backing up once hdup runs on simonback, instead of
restoring? I figure I must be doing something very basic wrong here.