Data Replication - NAS1 toward NAS2

Hi everyone. I’m new to the truenas world. I need to replicate data from NAS1 (source) to NAS2 (destination). NAS1 receives backups from the VEEAM server. But I would like the NAS2 to take care of the entire backup process. What do you suggest?

Change the Veeam server to back up directly to NAS2?

The way you have it explained I am not sure exactly what you are trying to back up where and what data is stored on which nas system currently. Is NAS2 just for all backups your goal? Is there other datasets on NAS1 to backup to NAS2?