If you ever happen to delete a folder with several tens of sites and don’t have a backup of your OPML file, don’t dispair, Mr. Samuel Clay has you covered!
My account’s OPML with the sites before the incident was in my posession after 30 minutes of telling him about my “accomplishment”. Another 30 minutes later the sites were back into the folder and my account is as good as before.
Thanks again, Samuel!