If you delete a project it will be deleted only on the server. The project related information on agent (build directory and everything inside) will live for indefinite time.

Automatically created build working directories should be deleted if there are no build configurations that can use them on the agent.
Can remove lines corresponding to incompatible or no longer existing build configurations from directory.map file. Alternatively, can track last build start time for every directory and remove ones that were not used more then some period. The period should be tweakable (in the main-config.xml?). Default value 2 weeks seems to be a good start.

Issue wasresolved