> **Note**: This feature requires JuiceFS >= 0.15.0.
JuiceFS supports [multiple metadata engines](databases_for_metadata.md). Each engine has its own internal format, but with the `dump` command it can export all the metadata to an identical [JSON](https://www.json.org/json-en.html) file ([example](../../pkg/meta/metadata.sample)). Meanwhile, there is also a `load` command to import metadata from the JSON file. Metadata backup, recovery and migration are achieved with these two [commands](command_reference.md#juicefs-dump).