According to Ed, the subdirectory for storing Undo transactions is named after the blpackage folder name and the bldeploy log is :bldeploy-[blpackageFolderName]-[deployjobid].[deployjobversion].log". I believe you may be able to use the CLI to cycle through the database to pull old BLDeploy logs and use NSH to delete their undo transaction directories. It would be a significant effort though.
Of course, if you DO clean them out, I'm not sure what effect it would have if you were to try to undo it at a later time.
Simply put, the undo would fail since it would not be able to find the bldeploy.xml file associated with undoing.
right, but for transactions that have been deleted from the CM/database - the corresponding directories on the targets systems should be safe to delete?