@clyde okay right but a full grown standalone USB2 transfers up to 40 MB/s that is 4 times faster as your LAN.
How fast is a Raspberry with his shared USB Controller? 10MB/s? 15? Didn't test but a NAS is dedicated for file moving and if the Pie 4 got some interface upgrades it is maybe as fast as your 2011 Synology (cool device BTW with the best UI I have ever seen)