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Note:
This is a copy of an article posted by Valery Letroye, on May 16, 2020, at https://www.beatificabytes.be/backup-synology-to-unraid/, which is now defunct somehow.
So this is just posted as a backup and not my own writing, but it was helpful learning about how to use rsync with Unraid and another NAS.
I've posted it here for reference only. Keep in mind it's geared towards a Synology NAS, and Unraid 6.8.
On my QNAP I found none of this necessary, but only found out much later after a lot of tinkering.
Backup Synology to Unraid
The easiest way to backup a Synology NAS to Unraid Server is to use Hyper Backup on Synology and rsync on Unraid.
Click to Close
First, enable rsync on your Unraid Server. It is preinstalled but not running as a daemon.
Create a file /boot/custom/etc/rsyncd.conf with the following content:
uid = root
gid = root
use chroot = no
max connections = 4
pid file = /var/run/rsyncd.pid
timeout = 600
[backups]
path = /mnt/user/backups
comment = Backups
read only = FALSE
Here above:
Next, create a file /boot/custom/etc/rc.d/S20-init.rsyncd with the following content:
#!/bin/bash
if ! grep ^rsync /etc/inetd.conf > /dev/null ; then
cat <<-EOF >> /etc/inetd.conf
rsync stream tcp nowait root /usr/sbin/tcpd /usr/bin/rsync --daemon
EOF
read PID < /var/run/inetd.pid
kill -1 ${PID}
fi
cp /boot/custom/etc/rsyncd.conf /etc/rsyncd.conf
Finally, add the following line in the file /boot/config/go :
#!/bin/bash bash /boot/custom/etc/rc.d/S20-init.rsyncd
Now, either reboot or execute: bash /boot/custom/etc/rc.d/S20-init.rsyncd
Go now on your Synology and open "Hyper Backup" to Create a new Data Backup Task:
Select rsync as Backup Destination:
And Create the backup Task with "rsync-compatible server" as Server Type: