Backup Time Capsule to 'cloud' / online backup provider
Another way is to do a second time capsule backup to the cloud.  As long as you can specify the location "as a folder" to time machine, then you have time machine making 2 backups for you.  

I do 2 backups, one to the Airport Time Capsule unit and one to a different network drive.  I know it is not in the cloud, but if you can do as I mentioned above, that is another way to do it.

I also use SOS backup to the cloud.  If I specify the time machine backup folder, it will do exactly as you are asking.