Hey if you have a Western Digital "Mybook" as part of your backup system it looks like you should disconnect it from the internet NOW, before it reformats itself.
https://community.wd.com/t/help-all-data-in-mybook-live-gone-and-owner-password-unknown/268111
@Phorm @anthracite it's a model called mybook live which is used for home Dropbox stuff. you're should be fine but maybe hold off plugging them in to any internet connected PC for a bit..