backup NAS recommendation -- Windows 2012 R2 ?

Which 32TB (RAID) backup solution
"NAS, Windows Storage Spaces, etc"
do you recommend for the below since
I do NOT want to use a CLOUD service ?
  ** assume a $2,000 LTO TAPE backup
     solution would be cheaper ?
  ** RAID-5 NAS from QNap/etc
  ** RAID-5 2nd Windows Server 2012 R2
     physical server running Storage Spaces/etc
  ** something else
 ** two locations
 ** one PHYSICAL 4TB server at each location
    with data that does NOT change very often
 ** 100 Mbps PRIVATE fiber line between sites
 ** 100% Windows 2012 R2 STANDARD HyperV
      ** DAILY
           --> incremental backups
           --> 14 day retention policy
           --> replicated to other location
      ** WEEKLY
           --> 4TB full backup
           --> 30 day retention policy,
                 ** 4 weeks @ 4TB
                      --> 16TB per site
           --> replicated to other location
                 ** 4 weeks @ 4TB
                      --> 16TB per site
      ** MONTHLY
           --> above 4TB WEEKLY full backup
           --> 1 year retention policy
           --> replicated to other location
                 ** done via TAPE to reduce
                    hard drive requirements
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David Johnson, CD, MVPOwnerCommented:
Don't use RAID-5 for anything over 8 TB use RAID6 or some other technology with 2 parity drives the actual cutoff is 12TB where the odds of a bit error corrupting is theoretically possible.

Many small drives give better performance and if a drive fails faster rebuild times but use more drive bays..  You did not give us the expected rate of change or the expected increase in a per day or per month basis.  Storage Spaces with JBOD' s are a lot cheaper than a dedicated NAS and RAID subsystem.

remember 3 copies x 2 different media x 1 offsite.

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