Thanks for the replies.
I had continued to dig after posting and found that Docker had been used successfully with Duplicati if a Synology NAS was running DSM v7.x so am pursueing that option. The reason it’s broken is that Synology changed the way root permissions are accessed with v7.x and it broke a LOT of other peoples apps as well. Not Duplicati’s fault at all.
2 links to setting up Docker on a Synology NAS, one specifically for Duplicati …
How to use Docker on a Synology NAS (Tutorial) - YouTube (Wundertech - Frank)
How to Install Duplicati on Your Synology NAS – Marius Hosting (Mariushosting - Marius)
Wundertech is excellent at explaining setting up Docker containers but his example uses a Pi-Hole container not Duplicati.
Marius’ example is for setting up a Duplicati container inside Docker.
Setting up Docker seems to be pretty much the best way to get Duplicati running but doing so is not for the faint hearted. It does have complexities and if anyone wants the Docker method but isn’t confident then asking their local nerd shop would be a good option to consider.
I have a few years nerd duty under my belt so, following those video’s I don’t anticipate too many issues.
Thanks again.