You can safely delete the following files/folders:
  • \npo\backups - this folder contains backups from the v11 to v12 upgrade.
  • Any folders that have "old" in their name - i.e. foundold, dlcold, etc.
  • Any files in the \npo\found\tempfiles folder that do not have today's date.
  • Any files in the \npo\found\dbbackups folder that are older than one month.