The rsync daemon of QNAP QTS is set to /etc/rsyncd.conf as in linux.
To rsync from a Linux system to a NAS, the commands used are the same as those used for rsync to a linux host, such as:
/usr/bin/rsync -avHS --numeric-ids --password-file=password file source path account @IP::target (module name)
NOTE: Configuring a backup through the GUI and setting the port, account, and password, etc. will be written to /etc/rsyncd.conf.