Large Backup Storage Appliance

I'm in the midst of designing a storage appliance to house client offsite backups which will replicate to one another bi-coastal (freenas replication).  The files housed on the storage appliance would range in 10GB - 50GB in nature, typically no smaller and are 95% writes versus reads.  There is likely a ingestion of 5 terabytes per day.  There are no VM's connected to this storage its only for offsite backup targets and replication.

Here is the hardware I'm currently looking at:...

Large Backup Storage Appliance