AD FastReporter uses database engine SQLite. For more information please visit: SQLite official homepage.
All generated reports are stored in the local SQLite database file: ADFastReporterXXXDB.db. Default location is %AppData%/AlbusBit/AD FastReporterXXX/.
XXX - Free or Pro.
You can change database file location should you want to share the database with co-workers. Please remember that the application must have rights to read/write this file.
Find out more about changing DB location.
You can turn off report saving to the database in Options-->General. Future reports will not then be saved in the database but existing reports will remain and will be visible.
To delete one report from a database, locate it and press Delete.