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On Debian they end up under /var/lib/docker/volumes/

Ah ok cool, I guess it isn't hard to find then.

I usually have my docker-compose.yml file in a dir along with the mapped volume directories. Allows me to just rsync that one folder to capture all config & data.

Are names volumes just a way to not have to worry about the files and leave them handled by docker?

Yea a use case would be to to persist application data when updating by pulling a newer container. Mapping to the host introduces the possibility of conflicts between the host and/or other containers.

You can move them as well.

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