For a long while I've used a NAS to store data (about 1.5TB), as my computer has a small SSD. The NAS has a single hard drive, and is a WD model (basic). My existing way of backing up the NAS is painful. It involves plugging in an external drive to the computer, and using Karen replicator to incrementally back up from the NAS, via the network and my computer, to the external drive. It works, but the computer crunches away for many, many hours with each backup, and it feels like I'm doing harm to the computer. Theoretically you can plug the external drive into the NAS directly, and it will clone itself, but it doesn't work properly and never has, and the interface is painful. Now I've upgraded to a new laptop, again with a small SSD and windows 10, and I'm keen to avoid this madness, especially as it only has wireless and no gigabit port. What's the best easy solution these days so that my 1.5TB NAS can be easily backed up onto an external disk with minimal pain? Do I need new hardware, and if so, what's the simplest?