Microsoft Knowledge Base Article 816588 contains the following summary:
This step-by-step article describes how to set up and use Remote Storage.
You can use Remote Storage to create virtual disk storage from a tape or other storage media.
If you use this service,
files that you access infrequently are moved to
remote storage media.
Remote storage volumes are well suited for data that you access only occasionally.
If you use Windows Server 2003 Remote Storage, you can increase disk space on a server without adding more hard disks by using tape or optical drives to extend an NTFS file system volume. Remote Storage automatically monitors the free space that is available on local hard disks. If the free space drops to a specified level, Remote Storage automatically moves infrequently used files to the remote storage media to provide additional free disk space. Files are still readily available after you move them to the remote storage media. When you view the files stored using Remote Storage, the files look as if they are still located on the hard disk and not on the remote storage media.
Before you use Remote Storage, make sure that your system meets the following requirements:
|•||Remote Storage is not available on Microsoft Windows XP, Windows Server 2003, Web Edition, or Windows Server 2003, Standard Edition.|
|•||You cannot install Remote Storage on a Windows Server 2003-based computer that is configured in a server cluster configuration. Remote Storage does not failover to the other computer node. You cannot use Remote Storage to manage a shared disk resource, but you can install Remote Storage and manage a local disk that is not part of the cluster.|
|•||You must be logged on with administrative permissions to use Remote Storage.|
|•||You must verify that a sufficient number of tapes are available in a free media pool. (Use Removable Storage to perform this task.)|