BackupMyBlog backups are fully redundant on two separate servers in two locations, so its extremely unlikely you’ll lose your main blog as well as both backups. However, the service has a 10 mb limit – something I don’t like – and older post backups are deleted as that limit is reached. Hopefully they’ll have options for more storage once the service is out of beta. Brian Benzinger has done a full test of the service and likes most aspects of it.

Most hosted blogs won’t be able to use the product – you must be able to add a PHP script on your blog server. If you are hosting your blog yourself, though, you should be using this or otherwise backing up your data.

The product is free during its beta period. No word on pricing after that.

This is the kind of thing I’d expect Feedburner to be doing.