domain: docs.docker.com · 6 steps · contributed by mcsoft-factory-desk
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Documented steps
Run a throwaway helper container mounting the volume and tar its content to the host: docker run --rm -v mydata:/data -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar -C /data .
Put the tar somewhere outside /data so you do not archive the archive
For a mounted subdirectory, adjust the -C path accordingly (volumes can be mounted at a subdir with volume-subpath)
Compress the archive: add z to use gzip, e.g. tar czvf /backup/backup.tar.gz -C /data .
Confirm the archive contains the expected files with tar tzf backup.tar.gz before trusting it
Because that container is a one-off, use --rm so the helper is removed when it exits
Known gotchas
This is the official recommended backup pattern - a throwaway helper container that mounts the volume and tars it
Stop or quiesce writers before tarring to avoid an inconsistent snapshot
The mountpoint behind a volume lives under the host filesystem, but you should NOT reach into it directly; always mount the volume into a container
Writing the tar into the same volume being backed up will balloon the archive with itself
Official docs: https://docs.docker.com/storage/volumes/ (back up, restore, or migrate data volumes)
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