...

lock file = /var/run/rsync.lock
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid

[code]
    path = /myFolderToShare
    comment = Data
    uid = root
    gid = root
    read only = yes
    list = yes
    auth users = john
    secrets file = /etc/rsyncd.secrets
    hosts allow = 192.168.1.0/255.255.255.0

Create Authentication File

vi /etc/rsyncd.secrets

Fill in the usernames and passwords:

john:password

chmod 600 /etc/rsyncd.secrets

...

Enable rsync at Bootup

systemctl enable rsync

Connecting to it using QNAP

From the QNAP Hybrid Backup Sync, select Storage Spaces.

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Click Create

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Select Remote RSync Server.

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Specify the details of the RSync Sever and click Create.

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Create Sync Job

From the Sync page, select Create and select Active Sync Job.

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Reference