NetApp dedup or Acronis dedup or both?

We bought a new NetApp storage server which a portion of will be used for the Acronis Storage Node for the backups. As part of the NetApp OS, it includes dedup functionality to dedup any files stored on the storage device. So does this mean we don't need the Acronis dedup and can just used what's already builtin to the NetApp device? What benefits does the Acronis dedup have, at an extra cost, that I won't get as part of the NetApp dedup functionality that's builtin? And I guess part of that depends on whether the Acronis backups are encrypted, which means that the NetApp dedup may not work at all.