With SFS still down and no news on when they might be back up, I’ve now added alternate Google Drive links to all my downloads (I hope).
In the future, all downloads will have an alternate link in addition to my usual download button. If anything, this experience has taught me how v. unwise it is to put all your eggs in one basket.
Edit, 24 Feb: SFS is back up, hooray, so now my download buttons work again. But as I said before, all future downloads will have alternate links, just to be on the safe side.