How do I back up the data in the Docker Mongo container locally?

  docker, question

Every time you restart your computer, you run docker start mongo, and then you enter the Mongo container through docker exec -ti mongo mongo find that the data in the Mongo container is gone. I want to know how to backup the data in the Mongo container. Just like you can export the data using mongoimport locally, because I just got in touch with docker, I hope the great gods can help me out. Thank you very much.

I personally recommend using -v, just mount the data directory

For example, mysql, I use -v to mount mysql data to data/mysql, and the data will not be lost.
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If you need backup, you can use the backup container dedicated to mongo client to back up the data after link -v mount backup to the local.