When I shut down Zimbra and tar /opt/zimbra to tape, I get this output:

tar: ./opt/zimbra/postfix-2.2.5/spool/public/flush: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/public/showq: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/public/cleanup: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/trace: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/smtp-amavis: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/local: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/cyrus: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/lmtp: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/proxymap: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/verify: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/maildrop: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/error: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/smtp: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/rewrite: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/tlsmgr: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/uucp: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/bsmtp: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/ifmail: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/virtual: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/old-cyrus: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/relay: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/anvil: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/bounce: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/discard: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/scache: socket ignored
tar: ./opt/zimbra/postfix-2.2.5/spool/private/defer: socket ignored

May I safely --exclude the /private/ and /public. dirs from the tar backup? I'll perform a ground up restore from tape to test; just thought I'd ask for some advice..

TIA
-John