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Since you're running it in docker all you need to do is change the mount locations in your docker-compose file. Then copy the existing data to the new location.
If you're currently using a volume instead of a bind mount then the existing data will be under /var/lib/docker/volumes
Apart from changing the docker config of your existing installation you can also symlink the new folder to the old location.
Or if Docker or Nextcloud doesn't like symlinks you can also mount the folder there. Folders can be mounted more or less the same as devices.
I'm not quite sure what you're trying to do here. Are you
If you're trying to do the second one, there's a useful guide on it here: https://omiid.me/notebook/25/move-docker-volume-to-bind-mount. The first one should be even simpler, you can just replace the volumes in the compose file by bind mounts (basically, just this step of the tutorial: https://omiid.me/notebook/25/move-docker-volume-to-bind-mount#modifying-docker-compose).
If you're doing a fresh instance it will solve a lot of issues. Personally I run a Nextcloud instance which got its own 2TB SSD. I mounted the disk at /nextcloud, then used bind mounts in docker compose for db and NC.