# Exporting changes to the data repository
<a name="export-changed-data"></a>

You can export data and metadata changes, including POSIX metadata, from Amazon File Cache to a linked Amazon S3 or NFS data repository. Associated POSIX metadata includes ownership, permissions, and timestamps. To export changes from the cache, use HSM commands. When you export a file or directory using HSM commands, your cache exports only data files and metadata that were created or modified since the last export. For more information, see [Exporting files using HSM commands](exporting-files-hsm.md).

**Important**  
For Amazon File Cache to export your data to your linked data repository, it must be stored in a UTF-8 compatible format.

**Topics**
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# Exporting files using HSM commands
](exporting-files-hsm.md)

# Exporting files using HSM commands
<a name="exporting-files-hsm"></a>

To export an individual file to your data repository and verify the success of the export, run the following commands. A return value of `states: (0x00000009) exists archived` indicates that export was successful.

```
sudo lfs hsm_archive path/to/export/file
sudo lfs hsm_state path/to/export/file
```

**Note**  
You must run the HSM commands (such as `hsm_archive`) as the root user or using `sudo`.

To export changes on an entire cache or an entire directory in your cache, run the following commands. If you export multiple files simultaneously, Amazon File Cache exports your files to your data repository in parallel.

```
nohup find local/directory -type f -print0 | xargs -0 -n 1 sudo lfs hsm_archive &
```

To determine whether the export is complete, run the following command.

```
find path/to/export/file -type f -print0 | xargs -0 -n 1 -P 8 sudo lfs hsm_state | awk '!/\<archived\>/ || /\<dirty\>/' | wc -l
```

If the command returns with zero files remaining, the export is complete.