I want to copy files from QNAP TS-119P II to Asustor AS-5102T directly. There are many solutions: including ftp, rsync, or mount a shared folder.In my case, rsync is the easiest solution.
TS-119P II runs QTS 4.3.3 while AS-5102T is ADM 2.7.1. Details steps might be different if you are using different firmware versions.
I will also talk about invalid characters in names and how ADM handle it. A must read for non-Windows users.