Remote Storage scanning restores files that have been migrated to storage to the local system before scanning.
Remote Storage monitors the amount of available space on the local system. When needed, Remote Storage automatically migrates the content (data) from eligible files from the client system to a storage device, such as a tape library. When a user opens a file whose data has been migrated, Remote Storage automatically recalls the data from the storage device.
Select the Files that have been migrated to storage option to configure the on-demand scanner to scan files that Remote Storage manages. When the scanner encounters a file with migrated content, it restores the file to the local system before scanning.
Note
This option doesn't apply to files stored in Microsoft OneDrive. The on-demand scanner doesn't download OneDrive files or scan files that haven't been downloaded.
For more information, see What is Remote Storage.