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@@ -119,7 +119,8 @@ You can also extend the chain by mounting the volume that came from the
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If you remove containers that mount volumes, including the initial `dbdata`
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container, or the subsequent containers `db1` and `db2`, the volumes will not
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-be deleted until there are no containers still referencing those volumes. This
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+be deleted. To delete the volume from disk, you must explicitly call
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+`docker rm -v` against the last container with a reference to the volume. This
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allows you to upgrade, or effectively migrate data volumes between containers.
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## Backup, restore, or migrate data volumes
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Peter Salvatore