Hi,
I may be wrong, but I am pretty sure, you can't use the 325's backup to backup files from a windows pc. The back up seems to only work with other similar Dlink devices. It might work with some linux pc's but I doubt that too. I also think that it is difficult to get say a W7 pc to use it's backup to work with any nas too although it might work if you map the nas as a drive. I do know that there is free software available to do this fairly easily. SyncBack is one and there is another named Allway Sync. There are others too I believe. If no one can give you a solution, you might try one of those. Good luck.