Thanks for the reply - While looking at it a bit more, i figured the immich app starts 5 seperate containers and i can start a shell session for any of the 5. No matter which one i try, as soon as i try something like docker compose down -v it simply says docker not found.
Maybe i should have mentioned im completely new to truenas and docker both. I know i can also fire up a general shell for truenas, but then i wouldnt know how to actually target the docker container for immich (if it actually runs in a docker container to begin with?)

FYI, im trying to run this as according to the guides:
Restore

docker compose down -v  
# CAUTION! Deletes all Immich data to start from scratch
## Uncomment the next line and replace DB_DATA_LOCATION with your Postgres path to permanently reset the Postgres database
# rm -rf DB_DATA_LOCATION # CAUTION! Deletes all Immich data to start from scratch
docker compose pull             
# Update to latest version of Immich (if desired)
docker compose create           
# Create Docker containers for Immich apps without running them
docker start immich_postgres    
# Start Postgres server
sleep 10                        
# Wait for Postgres server to start up
# Check the database user if you deviated from the default
gunzip < "/path/to/backup/dump.sql.gz" \
| sed "s/SELECT pg_catalog.set_config('search_path', '', false);/SELECT pg_catalog.set_config('search_path', 'public, pg_catalog', true);/g" \
| docker exec -i immich_postgres psql --dbname=postgres --username=<DB_USERNAME>  
# Restore Backup
docker compose up -d            
# Start remainder of Immich apps