Restore mail from backup

[Hamish]

Hello everyone
I am having trouble restoring files from a backup, I have made the backup just 
with rsync, so i have the contents of the 
spool/domain/mydomain.com/user/myuser in the backup. It seems that the user's 
mailbox has been deleted, so what I aim to do is create a new user with the 
same name, copy the files from the backup, then run reconstruct (please tell 
me if this is wrong)
I copy the files across, but in cyradm when `running reconstruct 
user/myuser at mydomain.com`
gives Operating System Error.
Could someone point me in the right direction?
Thanks,
H
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