I tried copying /opt/zimbra to the other box without modifications... failed...

I have a backup taken every night of each user, but I'd like to move the entire system faster... and on top of that, my backup does not save the shared calendars... it's done with:
/opt/zimbra/bin/zmmailbox -z -m username@domain.com getRestURL "//?fmt=tgz" > /backup/username`date +%y%m`.tgz

It works to restore... but I do not get everything... almost...

Any quick method for tranferring? Both systems are on a fast network... I tried to rcp the whole directory after installing a virgin ZCS 8.02 on the new Ubuntu 12.04 box... no luck...

Sorry for cross posting but I did not get any answer from the other forum...