The Workspace Cleanup Plugin does not play nicely with the Copy To Slave plugin. Here's a snippet from my console output for my build:
14:33:23 Deleting project workspace... done
14:33:23 [copy-to-slave] Copying 'Engine/Lib/*/.lib, Engine/Lib/*/.pdb, Engine/Lib/*/.a', excluding nothing, from 'file:/c:/JCI/workspace/Expat-Live/CONFIG/Debug/TARGET/GCC/VSVERSION/2008' on 'hudson.slaves.DumbSlave@720397f7' to 'file:/C:/JCI/current_build/Expat-Live/CL167206' on the master.
Note how the workspace is deleted before the copy step begins. Can this be fixed please? I assume deleting a workspace is something you'd always want to do last.
I'd be happy to test any fixes.