New External HDD backup device

I currently have a DLink NAS ... but it is painfully slow (9-12MB/s) , it also needs SMB which is discontinued by Windows (have to manually enable it)

I have never done anything with NAS other than use to have file backups, so maybe I don't need to bother with a NAS and use an External HDD enclosure and USB3 connection instead.

I need at least a 2 SATA bay unit, seen that CENMATE do what looks like useful units, anybody have a view on CENMATE or suggest alternative.(I want empty unit to reuse existing HDD) Seen they do a 2+3 unit, which gives 2 x SATA bays, and 3 x M.2 SSD slots.
Is there any special way of using the M.2 & SATA in combination ... does it allow for example provide high speed dump of files into the SSD and then migrates to SATA ? ..... just not sure what the purpose is.

Are you confusing a usb hard drive docking station with a hard drive enclosure?