This sounds like a change tracking use case. Create a template with the parts you need for the baseline (files, directories, services, etc). Attach it to a snapshot job and schedule it to run against your servers on a weekly basis. Bladelogic captures not only the inventory but also the differences from the previous snapshot (first snapshot is considered a baseline and has no diffs).
In BSARA you then use the reports in the change tracking domain. You have a variety of reports for summary and details. I would recommend starting with the "change tracking summary by policy" report, which will give you results by template names. You can then drill down to details by server.
Change tracking was introduced in OM 7.5 and is supported by all BSARA versions.