The Brother printers can save scanned pages to a folder over the network, which is called "Scan to Network Folder". This process utilises the SMB protocol to save files to a network folder. Although there is no specific information on whether this can be saved directly to a NAS, it is technically possible as long as the NAS is configured as a network folder and supports the SMB protocol. You need to make sure that the NAS is set up correctly and has the necessary permissions to receive files.