I guess that the container was destroyed with the data. is there any auto backup? mapping for local storage?

If you're looking for what docker volumes were used, that's in the docker compose file:
https://github.com/allegroai/clearml-server/blob/master/docker/docker-compose.yml

I restarted but now I have blank dashboard

Happy to help :)

do you know if I can restore the same container?

Is this after you've started the clearML server that you can't find the experiments?

I updated the docker-compose and it fixed, thanks

As far as I know, you can start a docker container with the same version and the same volumes and you should be able to just continue.