Best practices for location and permissions of "Docker" and "Appdata" directories?

I currently have my Docker directory set to /mnt/user/docker/ and the default appdata storage location set to /mnt/user/appdata. I then have the shares set up to use the cache only.

My issue is that Duplicacy backs up everything fine except for the /mnt/user/docker, where it has no privileges since that directory's ownership is root:root and the rest are nobody:users. The other day I CHMODded /mnt/user/docker to 777 and then the backup worked fine. Today somehow permissions are back to 710 (I noticed because Duplicacy failed).

BTW, I noticed when I did that CHMOD it took quite a long time and was wondering if that was due to some inefficiency caused by using the /mnt/user/docker route instead of going directly to /mnt/cache/docker and which is better.

What would be the best way to enable Duplicacy to back up the Docker directory without permissions issues, and should I change the Docker settings to /mnt/cache/docker and /mnt/cache/appdata instead of where they are now?

Thanks