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cornelius_blackfoot
This is (presumably) off-site replication rather than backup. It's not advised as a single backup method as if the hardware fails your backups are as screwed as your primary drives. You can do it if you want a hot standby, but you're trading off reliability for availability as NAS 2 is always on. If you go down this route, make sure you use the right combination of rsync options to ensure that you don't automatically delete files from your destination server in the case that a file is deleted from the source server. You can run a warm standby but it's not a substitute for backing up your data.
i have JBOD, single drives and RAID 10 in my NAS but I still back up to external HDs, not ones mounted and managed from within a NAS OS.