BooksOnBoard has (hopefully temporarily) shut down their site for new purchases, though you can still download titles from your library.
Instead of their usual welcome screen, you will be greeted by this when you attempt to access the site:
That sounds concerning but not too worrisome. However, over at The Digital Reader, Nate thinks it’s the beginning of the end. He has a detailed article about BooksOnBoard and their recent history of not paying their distributors.
His advice, which I will echo, is, “download and back up your library now.” If this is just a bump in the road, and they are back soon, all you’ve lost is a bit of time. Backing up your e-books is always a good idea anyway. If this is the end, you’ve saved whatever you bought from them in the past.
Loading your books into Calibre is a good way to back them up. If you’re not sure how to do that, you can refer back to my earlier post about loading books into Calibre.