Removing a Build Plan that has run on the default agent, the check-out data that is stored $BAMBOO_HOME/xml-data/build-dir gets deleted from the default agent.

However, if that build was run on a remote agent, the same directory does not get deleted from <bamboo-agent-home>/xml-data/build-dir when the Build Plan is deleted from Bamboo

Creating/deleting plans on a regular basis could cause build agents to run low on disk space unnecessarily.