tl;dr:<p>'The Backblaze login database has in no way been compromised. That said, we have seen a number of automated login attempts to our site and wanted to alert our users of the risk.'<p>Why would Backblaze send out such an e-mail just to inform about a general risk?<p>(And why does the e-mail contain clickable links? Phishing is another risk and the standard mitigation is to sell users NOT to click on links in such e-mails …)