The option "Export all items from this root folder path", requires a folder to start the export from. When using this option, the value can not be blank and utilizing "\" does not export from the Top of Information Store container, or Root of the archive. This limits the ability to utilize the subsequent "Remove exported items from archive" option to remove items exported.
Workaround:
In order to export items that are currently under the 'Top of Information Store' container, or the root, of the archive, the option "Export all items" must be used.
This issue has been addressed in the following release: