Business Objects has a repository that contains users, security and reference pointers to the Business Objects content such as reports and universes. This is held in a proprietary format.
The actual reports and universes are stored in the input file store, the location of which can be seen in the server properties of the input file server in the Central Management Console (CMC)
In the CMC, you can also see the file location of the universes and the reports by reviewing their properties
regards
James