NTFS Permissions Auditor use database engine - SQLite, for more information please visit SQLite official homepage.
All generated reports are stored in the local SQLite database file - NTFSPermissionsAuditor.db. Default location is %AppData%/AlbusBit/NTFSPermissionsAuditor/.
You can turn off report saving to the database in Options-->General. By turning it off, future audit results will not be saved in a database, but any existing audit results will remain in a database and will be visible any time.