I do basically the same setup except I use encryption on blue-ray burner to archive off site. These get shipped monthly to my fathers house 3000 miles away and get placed in his fireproof safe for long term archiving.
I also split off my on site storage to separate locations,
~ one cluster of rack mounted NAS's built with Ubuntu and 3Ware raid 5 controllers in my workshop on the other side of my property. ~ one cluster in the main house of yellow machines and tera stations.
This is connected to a Summit 450 Extreme Switch via dual gig fiber back to main house into a Cisco 3750 Switch.
I have a script that kicks off and sync's the in house to the workshop NAS's.
I also use Acronis and clone my laptop drive to the NAS's nightly because I use it in the field for work and this hobby.
I live in the NW and boy do we have windstorms better safe then sorry.