Vembu backups with Hyper-v Replication

We are using hyper-v replication on 2 hyper-v hosts, so what are best practices with VEMBU? Should you be backing up the live VM, or the replica VM? The replica would be perfered as it would reduce the load on the production host. But in the case of Exchange server it seems to be an outlier, as we are using VEMBU to handle log truncation, so I guess in that case it would have to be the live VM, correct? Thanks for any help and advice in advance.

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