Not sure of costs e.t.c but may want to consider using AWS S3 or Glacier depending on restore time needed e.t.c
You can now NDMP into S3:
http://www.jk-47.com/2015/04/a-look-at-netapps-ndmp-cloud-extension-software...
or investigate using Altavault (Steelstore VM) into AWS or Glacier?
One point to mention is S3 and Glacier have scanners to check for bit rot which tapes don't.
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