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IT administrators can define storage policies, which control the placement of online data storage and automatically migrate infrequently used files to secondary storage. This decreases the amount of online primary data storage required, and leverages existing secondary data storage and limited administrative resources. The entire file migration and recall process is transparent to the end-user, and is fully integrated with Legato NetWorker backup and restore operations. The Legato NetWorker HSM Client supports the automatic recall of migrated files on file systems accessed by applications and users on Windows NT, Unix, and NetWare operating systems.