Archiving PDF files

Hi

We are currently using Adobe Central Output Server 5.6 to collecting data to print or mail PDF files from AS400.

We are in search of archiving system that can automatically archive and store our pdf files, and also be accessible in the future through some kind of web application or some other application and also be compatible with Adobe Central Output Server 5.6.

Does Adobe have some kind of archiving system today for this purpose or is there any other application that could be recommend?

Any suggestions will be appreciated

Regards

M