I use rsnapshot to backup /opt/zimbra from my mail server using rsnapshot to a secondary mail server (as well as having a rolling nightly backup to another server).

/opt/zimbra on the rsnapshot server actually symlinks to my daily.0 (the latest rsnapshot archive) folder.

I have the same OS and same version of zimbra installed on this server, so am I safe to assume starting zimbra with /opt/zimbra as a symlink to the backup archive would work? The file ownership and permissions are in tact and match the live server.