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A: The Worker instances specified in the Cloud Formation templates are used to run Lustre HSM copytools. The only specific use case for them currently is to enable the Import Bucket feature of Cloud Edition, where the contents of an S3 bucket can be imported when the filesystem is created. This feature can be used to "pre-stage" a filesystem with files e.g. from AWS Public Datasets or other sources. After the import process completes, the files are available in a released state, and the file data is restored upon file access or explicit restore using Lustre HSM facilities. If this feature will not be used, it is safe and recommended to set the Worker instance count to 0 in the template parameters.