Back up your blog with "Backupmyblog"
Another startup referenced by TechCrunch, this time a blog-related one: BackUpMyBlog , which does exactly that-back up your blog, assuming your blog runs on mysql and is on a server you have the right to execute php scripts on. Thus, the only 6A product it will work with is MovableType. As the FAQ puts it:
Can you backup my LiveJournal, TypePad, MySpace or other hosted blog?
No. BackupMyBlog only works if you have rights to install scripts on your blog server.
I'm not sure this is really a business. I looked at the php script it generated and while it looks fine I can't claim it would be hard to reproduce. It seems more like something someone should just write and offer to people for free. Of course, BackUpMyBlog also has to maintain the repository where the backups get sent, but still.
It seems like it would be a good feature for MovableType, for 6A to maintain a backup server for MovableType users who were unwilling to set up backup for their MT installations. That seems like small market though-anyone smart enough to be able to set up and use Mtype is probably also smart enough to know they should be backing up their system.