I'm looking at various NAS products and at the moment comparing TerraMaster T6-423 with the Asustor AS6706T. The AS6706T has a slight edge (I think ... this is ongoing!!) in many aspects, but there are two
Both products impress me for various reasons, but in looking at Security which I'd expect to be high on Asustor's list of product concerns I note that Asustor are the only major NAS vendor not to have implemented WORM (write once, read many). With WORM you can set files so that they are read only for a specified period of time (years even) which could stop a Deadbolt type attack on that data.
I also note that TerraMaster has an "isolation mode" which shouldn't be too hard to implement, whereby you can quickly remove the system's internet access. Maybe Asustor has something similar? I'd be looking at something that could even go so far as to limit access to certain time periods, or turn it back on at a certain time.
Anyway ... shopping for a NAS is a journey, and I hope these thoughts are of use to Asustor.