Surefire Report history is not kept for prior builds

I'm not sure if this is a bug, or just existing behavior (i.e. maybe this is a wish).

Continuum is not keeping prior surefire reports that correspond to failed builds.

I added surefire-report:report-only to run the report after the build to get it to display the surefire report if there is a test case that failed, but it's not keeping a current version.

i.e. if I choose a prior build that has failures, it still shows the current surefire report which has successes.

Is this how it's supposed to work?