Move queue

[Sasa]

Hi, I have a mail server with postfix-2.5.6 and now in queue there's more 
2900 mails that I cann't delivery, I would copy the queue from official mail 
server to backup mail server, for this purpose ie I have:

mail server A (official)
mail server B (backup)
on server A I must:

#postfix stop
#cd /var/spool/postfix

copy all directory (restore incoming, active, deferred ) to backup server 
always in "/var/spool/postfix".
This procedure is correct ?
Thanks.

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  Salvatore.