# Best Practices for Hitachi NAS

Review the following best practices before using Hitachi NAS.

## Considerations for the Revert Operation

- The revert operation is applied to the entire file system, because snapshots are taken at the file system level.

- If you run backup operation on a subdirectory, snapshots are still taken at the file system level and the revert operation reverts the whole the file system, even other subdirectories that you did not include in the backup operation.

- The revert operation is not supported if the Hitachi NAS file server REST API is set to 'native' mode. To run the revert operation, you must set the file server REST API to 'legacy' mode.

- Hitachi NAS 14.6 does not support the snapshot revert operation as the 'legacy' mode cannot be enabled on the REST API server.

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