You can restore a file from a physical backup by accessing the FLR command in the My Repositories view.
FLR is accessible regardless of how the savepoints are sorted. You can right-click the savepoint in the Working Repository pane to select the command or you can click to highlight the savepoint and then click the FLR icon in the toolbar.
There is no need to copy or recreate the contents of the disk. The data remains compressed. When you make an FLR request, only the relevant files are moved from the repository to the designated computer.