Working with CA support - we had old EMs version 9.1 we got new servers and installed new 10.1 EM. We moved over the management modules, and appear to have moved some required .jar files into a backup folder ManagementModule_Bu which now associated the .jar files as backup. We were trying to trim unknown .jar files and might have eliminated some that are required.
Working now to get a list of "required .jar files" that need to remain in management module.
Went to a virgin install of APM 10.1 Management Modules and they are:

Question remains which ones do I need (mandatory) and which ones of the default install can we remove without issue?
Proof

Here are the mandatory ones as per CA tech support:
config\modules
06/22/2015 10:59 PM 95,967 SampleManagementModule.jar
06/22/2015 10:56 PM 32,680 SPM_ManagementModule.jar
06/12/2015 01:46 PM 9,057 Supportability.jar
06/22/2015 10:49 PM 2,219 TradeService.jar
06/22/2015 10:51 PM 1,762 TriageMapConfigurationsManagementModule.jar