Did you establish a share folder to your NAS backup location? This is done in advanced settings of the container and only editable when the container is not running. Here is mine as an example:
First share is for all the NR data so I can automatically backup my flows. Second is a share I use to capture the backups and drop into a sub folder in my flow.
Edit: just remembered I had uploaded my backup flow to GitHub a while ago. Might be useful for you. I am traveling at the moment with no access to a computer.
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