If you reinstall your operating system OR clean all browser data, your keyboard will be lost. So, you can use Exporter wizard to backup before reinstalling OS/cleaning data. You also can use this functionality to sync your keyboard between devices (PC, Mac, Mobile, Tablet etc), just by exporting and importing the backup key.
If you don't have any keyboards, you can try to use our sample here. Just copy all of text in this link and paste to bellow text box.