I'm interested in your rassberry pi nas. Can it be done with a pi0? I've got one laying around and would love to put it to good use. I'm familiar with syncthing so it doesn't sound too much trouble for me right now.
I would expect that a pi0 could do it - depends on what sort of performance you want. An of course for a NAS you are better off with an Ethernet port - I would recommend a full-size SBC for this reason. But no fundamental reason why a pi0 can't do it. Here's a nice example: https://hackaday.io/project/8688-raspberry-pi-zero-altoid-na...
not OP, but I tried to setup a NAS with my older B+, and it was really unreliable. The disk went to sleep every few minutes even when there was a file being read/written.
Dang. My journey for a practical use of my pi 0 continues...
Fwiw, I don't remember having drive problems when I used a pi zero as a small NAS. I do remember configuring the drives to never idle and spin down, though. I think I used hdparm and I definitely had a power supply that could support the drives.