What do you mean by "continuously backing up?" If it is running a backup, it needs to run to completion. Or, you can cancel the backup.
If you are unable to cancel the backup, please contact support.
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
-steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator