Is there an easy way to remotely backup an unraid server's data to a truenas server running off site?

 

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You can use for example rsync over SSH.

on unraid you will need to install the user script plugin to use terminal to run the rsync command to truenas.

You will either need to use the unassign plugin to Mount a truesnas share or use rsync over ssh.

 

ex:

https://linuxize.com/post/how-to-transfer-files-with-rsync-over-ssh/

https://phoenixnap.com/kb/how-to-rsync-over-ssh

 

Please see 

for an example, command and script.

I use rsync to copy, and backup data from disk to disk on my system

example:
 

#!/bin/bash
#cd /mnt/user
rsync -anv --exclude='/mnt/user/appdata/lxddata' "/mnt/user/appdata/" "/mnt/user/Program-Installers-PCRepair/Other OS/Docker-Rsync-Backup/"