We lost a website on Bluehost yesterday - it reverted back to a VERY old database (ie it's currently useless). On top of that, the Bluehost backup server crashed yesterday and as of last night, was still not restored. It appears to have only effected a very limited number of customers. However; if you're on BH, you might want to take a thorough look at your site(s) as a precaution.
Update - about 3 weeks of files GONE from the server. Luckily there was one from 1/24, so it was recovered. Lesson learned - probably a good idea to do your own backups as a precaution. No explanation available from BH.