Rsync: Preserve / Copy Hard Links ( Backup Rsnapshot Directory Tree )

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I‘m using rsnapshot filesystem snapshot utility to make incremental snapshots of local and remote filesystems for 10 production servers running on RHEL 5.x system. The rsnapshot commands makes extensive use of hard links, so if the file doesn’t change, the next snapshot is simply a hard link to the exact same file. How do I use the rsync command to copy my the entire snapshot directory /raid6/rsnapshot/ (around 4TB) to a remote server for mirroring purpose?