Why do I get these when I run a backup of zimbra. I shutdown zimbra and then run this command cp -r /opt/zimbra /folder/destination

root@mail:~# cp -r /opt/zimbra /home/nick
cp: cannot create fifo `/home/nick/zimbra/postfix-2.2.9/spool/public/pickup': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/public/cleanup': File exists
cp: cannot create fifo `/home/nick/zimbra/postfix-2.2.9/spool/public/qmgr': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/public/flush': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/public/showq': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/tlsmgr': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/rewrite': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/bounce': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/defer': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/trace': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/verify': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/proxymap': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/smtp': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/relay': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/error': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/discard': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/local': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/virtual': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/lmtp': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/anvil': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/scache': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/maildrop': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/old-cyrus': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/cyrus': File exists
cp: cannot create special file `/home/nick/zimbra/postfix-2.2.9/spool/private/uucp': File exists