EnglishI found out, my disk recently ran out of storage and needed to upgrade. Since Mailcow Dockerized is the only thing running on the server, I had checked it first.
Mailcow container uses over 9 GB of storage while my domains just got about 5. How comes it that the Mailcow service uses that much storage? Is there a safe way to cleanup without reset?
docker-compose ps => !!IMPORTANT!! Check first if all container are UP and RUNNING.
docker system prune => this will delete all the garbage and makes a lot of space free.
I run this commands after all update.
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Thank you! I was able to cleanup 1,2 GB 
But please always check before if the containers are all running, otherwise delete them with what becomes a big problem