Here's the answer that Synology gave
If the usb drive is connected but NOT shared or accessible from the network would that not be enough?
No because if it's connected to the NAS the user of the nas have access rights to it, so if the ransomware comes to the NAS it will encrypt everything the the user of the NAS have read/write access to
If the usb drive is connected but NOT shared or accessible from the network would that not be enough?
No because if it's connected to the NAS the user of the nas have access rights to it, so if the ransomware comes to the NAS it will encrypt everything the the user of the NAS have read/write access to