Official AiO migration docs https://github.com/nextcloud/all-in-one?tab=readme-ov-file#how-to-migrate-from-an-already-existing-nextcloud-installation-to-nextcloud-aio - no idea if there any TrueNas specifics you must follow. you also could review and adopt this guides How to docker-compose with notify_push (2024) and Nextcloud docker compose setup with Caddy (2024)
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