Disclib is tool for creating and maintaining catalog(s) of your CDs and DVDs. Data is stored in one single file, so it is easy to move and backup.
It also contains search function to find your files based on file name etc. (not the content, of course). This way it is faster to find your backups.
For a huge amount DVDs, the program becomes significantly slower to startup, but I guess it happens with many cataloging software (?). Luckily it is possible to use several separate catalogs to limit the volume.