They got it "working" on Saturday, and then knocked off for the rest of the weekend, as far as I can tell, leaving backups and restores not working.
And also - the RSS feeds which my links posts are generated from.
I'm guessing that they'll come back into work on Tuesday and fix things.
(I'd move to a different link storage site, but the only real alternative site I'm aware of is Pinboard.in, and that doesn't autofill tags using all of your existing tags, just the most popular ones, which is rubbish for me, as I have over 3000 of them.)
Original post on Dreamwidth - there are comments there.