Fastest way to copy files between NASs?

stevebower wrote:
I notice now though that the FTP service was enabled, but each device has the same masquerade name, so have changed this to the individual device names, & seems to allow the setup.

That explains it. The same frontview config page for rsync also has the FTP parameters, and it apparently was checking the FTP config. The error sounds like the masquerade name was actually wrong (not found in DNS) as opposed to duplicated. The FTP client I use (filezilla) doesn't need masquerade to be set in order to access FTP from the WAN. You probably will want to sort that issue out after you get the new NAS set up.

I don't use Hosts access permissions for this, though I have everyone access set to read/write.

On the home shares, I think you can use the associated username/password. Note in some cases "test connection" fails but the actual backup succeeds (and vice versa).