If you decide to convert your volumes over to NSS (which I recommend). You can use that conversion utility, reload the server or delete the volume and restore data.
Personally, I used the reload method because there was a lot of junk left on the server that had been upgraded from a couple of times.
But, if you want to delete the volume and restore from backup, MAKE SURE you choose the option in your backup solution to "Decompress compress files" because NSS volumes won't take compressed data from a traditional volumes. For example, in Brightstor, the option was "Force Decompression of Compressed Files" and that should be used on the backup prior to deletion of volume/restoration of data.
Also, you want to take a backup of the trustees, just in case they are not restored. Use something like Trustbar or Trustee, I can't remember which is the newer method.
NSS volumes will load much faster and you will be happy if you convert!!.