The Key normally copies from the selected folder and all of its
subfolders and all of their subfolders and so forth. If the `Copy
Subfolders' box is unchecked, then The Key copies only from the selected
folder. This is useful if you want to copy one file. For example, if
the input is E:\
FOO and FOO is a file in E:\
,
you must uncheck the `Copy subfolders' option to prevent files named
FOO in subfolders of E:\
to be copied. The box should
normally be checked when restoring from backup disks.