360 Renewal vs. Norton Security

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Given it is renewal time,

  1. What is the difference between renewing Norton 360 premier vs purchasing Norton Security?
    1. If I renew Norton 360 premier do I keep all the features I have? Do I get the same security software that comes with Norton Security?
    2. If I move to Norton Security, do I lose any of the other features, like tuneup, that I now have?
  2. Currently I have 5 devices. It appears that NS has 5; NS with backup has 10. Is this correct?
    1. Since 25GB would barely backup either my music OR my pictures and would not even begin to backup the 650GB of files, the backup function is of little use to me. Is there any other benefit to going with the version with backup other than the 5 extra devices (if that is the case)?
  3. If I purchase NS (either from Symantec or a 3rd party) since it is a new product, how do I get the remaining time of my 360 subscription added to it?

Thanks.