Backup config conflicts with Exchange

When I run the configuration for the native backup in SBS 2011 I get a warning saying "Warning cannot disable circular logging for backing up Exchange".

I did not setup this system originally. Exchange is not used for this company.

When I open up Exchange I get the following message: Connecting to the remote server failed with the following error message  The WinRm Client received an HTTP error server service error (500).

If Exchange is not active on this server, can I disable it entirely?

Thanks,

Paul

PAUL