= The command 'docker service inspect http' will display detailed information on the 'http' service, such as its ID, name, mode, replicas, container spec, networks, ports, etc. However, it will not show the list of historical tasks for the service. To view the list of tasks, you need to use the command 'docker service ps http', which will show the ID, name, image, node, desired state, current state, and error of each task12. Reference:
1: docker service inspect | Docker Docs
2: docker service ps | Docker Docs

Explanation
= Keeping a backup copy of the image on another repository is not how a user can prevent an image, such as
'nginx:latest', from being overwritten by another user with push access to the repository. This approach does not prevent the original image from being overwritten, it only provides a way to restore it from another source.
However, this may not be reliable or efficient, as the backup repository may not be in sync with the original one, or may not be accessible at all times. To prevent an image from being overwritten by another user, the user can use the DTR web UI to make the tag immutable1. This feature allows the user to lock a specific tag, so that no one can push a new image with the same tag to the repository. This ensures that the image is always consistent and secure1. References:
* Make a tag immutable | Docker Docs