Question about TP-Link Tl-Wr902ac

I had also had something like this in mind. But the mini router could not supply enough power to operate a 2.5-inch hard drive. With a USB memory stick it worked in principle, but access to it was extremely unreliable and slow. Since I've been using a "normal", larger wifi router, there are no problems. Of course, it doesn't reach the speed of a NAS, but it's enough for my purposes.